CHECKLIST OF GREAT LAKES DIATOMS


Provided below is the updated checklist which was published by Stoermer, Kreis and Andresen (1999) in the Journal of Great Lakes Research 25(3):515-566. Taxa as originally reported appear in the main body of the list. If a taxon has a synonym it is linked to the recommended synonym.



Acanthoceras zachariasii (Brun) Simonsen


Achnanthes affinis Grunow
Achnanthes altaica (Poretzky) A.Cleve
Achnanthes amoena Hust.
Achnanthes atacamae Hust.
Achnanthes biasolettiana (Kütz.) Grunow (see note 1)
Psammothidium abundans fo. rosenstockii (Lange-Bert. in Lange-Bert. & Krammer) Bukht.
Achnanthes bioreti Germain
Achnanthes brevipes C. Agardh
Achnanthes brevipes var. intermedia (Kütz.) Cleve
Achnanthes calcar (Cleve) Cleve
Achnanthes clevei Grunow
Achnanthes clevei var. balcanica fo. rostrata Hust.
Achnanthes clevei var. rostrata Hust.
Achnanthes coarctata (Bréb.) Grunow
Achnanthes conspicua A.Mayer
Achnanthes conspicua var. brevistriata Hust.
Achnanthes deflexa C.W.Reimer in Patrick & Reimer
Achnanthes delicatula (Kütz.) Grunow
Achnanthes depressa (Cleve) Hust.
Achnanthes detha Hohn and Hellerm.
Achnanthes didyma Hust.
Achnanthes dispar Cleve
Achnanthes dispar var. angulata Hust.
Achnanthes dispar var. fontellii A.Cleve
Achnanthes duthii Sreen.
Achnanthes elliptica var. elongata A.Cleve
Achnanthes exigua Grunow
Achnanthes exigua var. constricta (Grunow) Hust.
Achnanthes exigua var. heterovalva Krasske
Achnanthes exigua var. heterovalva fo. semiaperta H.Guermeur
Achnanthes exigua var. heterovalvata Krasske [orthographic error]
Achnanthes exigua var. heterovalva Krasske
Achnanthes exilis Kütz.
Achnanthes flexella (Kütz.) Brun
Achnanthes flexella var. alpestris Brun
Achnanthes gibberula Grunow
Achnanthes gracillima Hust. emend. Foged (see note 2)
Achnanthes gracillima var. nipponica Sovereign
Achnanthes hauckiana Grunow
Achnanthes hauckiana var. rostrata Schulz
Achnanthes hetensis A.Cleve [orthographic error]
Achnanthes hettensis A.Cleve
Achnanthes hungarica (Grunow) Grunow
Achnanthes incognita Krasske
Achnanthes joursacense Hérib.
Achnanthes kolbei Hust.
Achnanthes kryophila J.B.Petersen
Achnanthes kryophila var. africana Choln.
Achnanthes lanceolata (Bréb.) Grunow
Achnanthes lanceolata var. abbreviata C.W.Reimer
Achnanthes lanceolata var. apiculata R.M.Patrick
Achnanthes lanceolata var. bimaculata Hust.
Achnanthes lanceolata var. dubia Grunow
Achnanthes lanceolata var. elliptica Cleve
Achnanthes lanceolata var. genuina A.Mayer
Achnanthes lanceolata var. haynaldii (Schaarsch.) Cleve
Achnanthes lanceolata var. lanceolatoides (Sovereign) C.W.Reimer
Achnanthes lanceolata var. omissa C.W.Reimer
Achnanthes lanceolata var. robusta Hust.
Achnanthes lanceolatoides Sovereign
Achnanthes lapidosa Krasske
Achnanthes lapponica (Hust.) Hust.
Achnanthes lapponica var. ninckei (H.Guerm. & Mang.) C.W.Reimer (see note 3)
Achnanthes laterostrata Hust.
Achnanthes lauenburgiana Hust.
Achnanthes lemmermannii Hust.
Achnanthes levanderiHust.
Achnanthes levanderi var. helvetica Hust.
Achnanthes lewisiana R.M.Patrick
Achnanthes linearis (W.Sm.) Grunow
Achnanthes linearis var. pusilla Grunow
Achnanthes linearis var. nipponica Skvortzov
Achnanthes linearis fo. curta H.L.Sm.
Achnanthes marginulata Grunow
Achnanthes microcephala (Kütz.) Grunow
Achnanthes minutissima Kütz.
Achnanthes minutissima var. cryptocephala Grunow
Achnanthes minutissima var. robusta Hust.
Achnanthes nodosa A.Cleve
Achnanthes nollii Bock
Achnanthes oestrupi (H.Bachm. & A.Cleve) Hust.
Achnanthes oestrupi var. lanceolata Hust.
Achnanthes oestrupii var. pungens (A.Cleve) Lange-Bert. in Lange-Bert. & Krammer
Achnanthes peragalli Brun & Hérib.
Achnanthes peragalli var. fossilis Temp. & M. Perag.
Achnanthes peragalli var. parvula (R.M.Patrick) C.W.Reimer
Achnanthes pinnata Hust.
Achnanthes ploenensis Hust.
Achnanthes procera Hust.
Achnanthes recurvata Hust.
Achnanthes sublaevis Hust.(see note 5)
Achnanthes subsaloides Hust.
Achnanthes subsalsa J.B.Petersen
Achnanthes suchlandti Hust. [orthographic error]
Achnanthes suchlandtii Hust.
Achnanthes thermalis (Rabenh.) Schönfeld
Achnanthes trinodis (W.Sm.) Grunow
Achnanthes ventralis (Krasske) Lange-Bert. in Lange-Bert. & Krammer
Achnanthes ventraloconfusa fo. simplex Lange-Bert. in Lange-Bert. & Krammer
Achnanthes wellsiae C.W.Reimer


Achnanthidium affine (Grunow) Czarn.
Achnanthidium biasolettianum (Grunow in Cleve & Grunow) Bukht. & Round
Achnanthidium brevipes var. intermedia (Kütz.) Cleve
Achnanthidium clevei (Grunow in Cleve & Grunow) Czarn.
Achnanthidium clevei var. rostratum (Hust.) M.B.Edlund
Achnanthidium delicatulum Kütz.
Achnanthidium duthii (Sreen.) M.B.Edlund
Achnanthidium exiguum (Grunow) Czarn.
Achnanthidium exiguum var. heterovalvum (Krasske) Czarn.
Achnanthidium exilis (Kütz.) Bukht.
Achnanthidium flexellum (Kütz.) Bréb.
Achnanthidium hungaricum Grunow
Achnanthidium kryophila (J.B.Petersen) Bukht.
Achnanthidium lanceolatum Bréb. in Kütz.
Achnanthidium lanceolatum var. elliptica Cleve
Achnanthidium lanceolatum var. genuinum A.Mayer
Achnanthidium lanceolata var. haynaldii (Schaarsch.) Cleve
Achnanthidium lineare W.Sm.
Achnanthidium microcephalum (Kütz.) vide Rabenh.
Achnanthidium minutissimum (Kütz.) Czarn.
Achnanthidium trinodis Arnott ex Ralfs in Pritchard


Actinocyclus niagarae H.L.Sm.
Actinocyclus normanii (Greg.) Hust.
Actinocyclus normanii fo. subsalsa (Juhl.-Dannf.) Hust.
Actinocyclus normanii var. subsalsa (Juhl.-Dannf.) Hust. [nom. nud.]

Actinoptychus sp.


Amphipleura arctica R.M.Patrick & Freese
Amphipleura delicatissima [nom. illegit.]
Amphipleura kriegeriana (Krasske) Hust.
Amphipleura pellucida (Kütz.) Kütz.
Amphipleura sigmoida W.Sm.


Amphiprora alata (Ehrenb.) Kütz.
Amphiprora calumetica Thomas in Thomas & Chase
Amphora calumetica (Thomas ex Wolle) M.Perag.
Amphiprora ornata J.W.Bail.
Amphiprora paludosa W.Sm.


Amphitropis ornata (J.W.Bail.) Grunow


Amphora bullatoides Hohn & Hellerm.
Amphora calumetica (Thomas in Thomas & Chase) M.Perag.
Amphora coffeaeformis (C.Agardh) Kütz.
Amphora coffeiformis (C.Agardh) Kütz. [orthographic error]
Amphora coffeaeformis var. acutiuscula (Kütz.) Hust.
Amphora coffeiformis var. acutiuscula (Kütz.) Hust. [orthographic error]
Amphora coffeiformis (C.Agardh) Kütz. [orthographic error]
Amphora commutata Grunow
Amphora crucifera A.Cleve
Amphora cruciferoides Stoermer & Yang
Amphora delicatissima Krasske
Amphora exigua Greg.
Amphora fonticola Maill.
Amphora gigas Ehrenb.
Amphora hemicycla Stoermer & Yang
Amphora hemicyla Stoermer & Yang [orthographic error](see note 6)
Amphora huronensis Stoermer & Yang
Amphora inariensis Krammer
Amphora lanceolate var. ? [nom. illegit.]
Amphora libyca Ehrenb.
Amphora michiganensis Stoermer & Yang
Amphora montana Krasske
Amphora neglecta Stoermer & Yang
Amphora normanii Rabenh.
Amphora oligotraphenta Lange-Bert. in Lange-Bertalot & Metzeltin
Amphora ovalis (Kütz.) Kütz.
Amphora ovalis var. affinis (Kütz.) VanHeurck ex DeToni
Amphora ovalis var. affins (Kütz.) Van Heurck [orthographic error]
Amphora ovalis var. constricta Skvortzov
Amphora ovalis var. gracilis (Ehrenb.) Van Heurck
Amphora ovalis var. libyca (Ehrenb.) Cleve
Amphora ovalis var. minor H.H.Chase [nom. illegit.]
Amphora ovalis var. minutissima (W.Sm.) Hurter
Amphora ovalis var. pediculatus (Kütz.) Van Heurck [orthographic error]
Amphora ovalis var. pediculus (Kütz.) Van Heurck ex DeToni
Amphora ovalis var. ? [nom. illegit.]
Amphora ovalis var. b [nom. illegit.]
Amphora ovalis var. ? Kütz. [nom. illegit.]
Amphora ovalis var. nov. [nom. illegit.]
Amphora parallelistriata Mang.
Amphora perpusilla (Grunow) Grunow
Amphora rotunda Skvortzov
Amphora sibirica Skvortzov & Meyer
Amphora subcostulata Stoermer & Yang
Amphora submontana Hust. (see note 7)
Amphora tenuistriata Mang. in Bourr. & Mang.
Amphora thumensis (Mayer) A.Cleve
Amphora veneta Kütz.
Amphora veneta var. angularis [nom. nud.]
Amphora veneta var. capitata Haworth


Aneumastus minor (Hust.) Lange-Bert.
Aneumastus stroesei (Østrup) D.G.Mann in Round, Crawford & Mann
Aneumastus tusculus (Ehrenb.) D.G.Mann & Stickle in Round, Crawford & Mann


Anomoeoneis costata (Kütz.) Hust.
Anomoeoneis exilis Kütz.
Anomoeoneis follis (Ehrenb.) Cleve
Anomoeoneis sculpta (Ehrenb.) O.Müll.
Anomoeoneis serians (Bréb.) Cleve
Anomoeoneis serians var. brachysira (Bréb.) Hust.
Anomoeoneis sphaerophora (Ehrenb.) Pfitz.
Anomoeoneis sphaerophora fo. costata (Kütz.) A.M.Schmid
Anomoeoneis sphaerophora var. sculpta O.Müll.
Anomoeoneis styriaca (Grunow) Hust.
Anomoeoneis vitrea (Grunow) Ross in Patrick & Reimer
Anomoeoneis zellensis (Grunow) Cleve
Anomoeoneis zellensis fo. difficilis (Grunow) Hust.


Asterionella bleakeleyi W.Sm.
Asterionella falfsii W.Sm. [orthographic error]
Asterionella formosa Hass.
Asterionella formosa var. acaroides Lemm.
Asterionella formosa var. gracillima (Hantzsch) Grunow in VanHeurck
Asterionella formosa var. subtilis Grunow
Asterionella gracillima (Hantzsch) Heib.
Asterionella ralfsii W.Sm.


Attheya zachariasii Brun


Aulacoseira agassizii (Ostenf.) Simonsen
Aulacoseira agassizii var. malayensis (Hust.) Simonsen
Aulacoseira alpigena (Grunow) Krammer
Aulacoseira ambigua (Grunow) Simonsen
Aulacoseira canadensis (Hust.) Simonsen
Aulacoseira distans (Ehrenb.) Simonsen
Aulacoseira distans var. alpigena (Grunow) Simonsen
Aulacoseira distans var. limnetica (O.Müll.) Simonsen
Aulacoseira granulata (Ehrenb.) Simonsen
Aulacoseira granulata var. angustissima (O.Müll.) Simonsen
Aulacoseira granulata var. angustissima fo. spiralis (Hust.) Czarn. & Reinke
Aulacoseira granulata var. muzzanensis (F.Meister) Simonsen
Aulacoseira islandica (O.Müll.) Simonsen
Aulacoseira islandica subsp. helvetica (O.Müll.) Simonsen
Aulacoseira italica (Ehrenb.) Simonsen
Aulacoseira italica var. tenuissima (Grunow) Simonsen
Aulacoseira italica var. valida (Grunow) Simonsen
Aulacoseira italica subsp. subarctica (O.Müll.) Simonsen
Aulacoseira lirata var. alpigena (Grunow) Haworth
Aulacoseira subarctica (O.Müll.) Haworth
Aulacoseira valilda (Grunow) Krammer in Krammer & Lange-Bert.


Aulacosira granulata (Ehrenb.) Simonsen [orthographic error]
Aulacosira granulata var. angustissima (O.Müll.) Simonsen [orthographic error]
Aulacosira islandica (O.Müll.) Simonsen [orthographic error]
Aulacosira italica (Ehrenb.) Simonsen [orthographic error]
Aulacosira italica subsp. subarctica (O.Müll.) Simonsen [orthographic error]


Bacillaria paradoxaGmelin
Bacillaria paxillifer (O.F.Müll.) Hendy


Biddulphia laevis Ehrenb.


Brachysira exilis (Kütz.) Round & D.G.Mann
Brachysira follis (Ehrenb.) Ross in Hartley
Brachysira brebissonii Ross in Hartley
Brachysira serians (Bréb. ex Kütz.) Round & D.G.Mann
Brachysira sphaerophora (Kütz.) Round ex D.G.Mann [transfer invalid](see note 8)
Anomoeoneis sphaerophora (Kütz.) Pfitz.
Brachysira styriaca (Grunow in VanHeurck) Ross in Hartley
Brachysira vitrea (Grunow) Ross in Hartley
Brachysira zellensis (Grunow) Round & D.G.Mann
Brachysira zellensis fo. difficilis (Grunow in VanHeurck) Hamilton


Caloneis alpestris (Grunow) Cleve
Caloneis amphisbaena (Bory) Cleve
Caloneis bacillaris (Greg.) Cleve
Caloneis bacillaris var. thermalis (Grunow) A.Cleve
Caloneis bacillum (Grunow) Cleve
Caloneis bacillum var. fontinalis Hust.
Caloneis bacillum var. lancettula (Schulz) Hust.
Caloneis clevei (Lagerst.) Cleve
Caloneis clevei var. undulata Krasske
Caloneis fontinalis (Grunow) Lange-Bert. & Reichardt in Lange-Bertalot & Metzeltin
Caloneis formosa Greg.
Caloneis hyalina Hust.
Caloneis lamella Zakrz.
Caloneis lancettula (Schulz) Lange-Bert. & Witkowski in Lange-Bertalot & Metzeltin
Caloneis leptosoma (Grunow) Krammer in Krammer & Lange-Bert.
Caloneis lewisii R.M.Patrick
Caloneis liber (W.Sm.) Cleve
Caloneis limosa (Kütz.) R.M.Patrick
Caloneis limosa var. gibberula (Kütz.) Grunow
Caloneis limosa var. subinflata Grunow
Caloneis limosa var. undulata Grunow
Caloneis molaris (Grunow) Krammer in Krammer & Lange-Bert.
Caloneis nubicola (Grunow) Cleve
Caloneis pulchra Messik.
Caloneis pulchra var. interrupta Gandhi
Caloneis schumanniana (Grunow) Cleve
Caloneis schumanniana var. biconstricta Grunow
Caloneis schumanniana var. lancettula Hust.
Caloneis silicula (Ehrenb.) Cleve
Caloneis silicula var. inflata (Grunow) Cleve
Caloneis silicula var. limosa (Kütz.) VanLand.
Caloneis silicula var. undulata (Grunow) Cleve
Caloneis silicula var. truncatula (Grunow) Cleve
Caloneis silicula var. tumida Hust.
Caloneis silicata var. tumida Hust. [nom. nud.]
Caloneis tenuis (Greg.) Krammer in Krammer & Lange-Bert.
Caloneis undulata (Greg.) Krammer in Krammer & Lange-Bert.
Caloneis ventricosa (Ehrenb.) F.Meister
Caloneis ventricosa var. minuta (Grunow) R.M.Patrick
Caloneis ventricosa var. truncatula (Grunow) F.Meister
Caloneis ventricosa var. trunculata [orthographic error]


Campylodiscus clypeus Ehrenb.
Campylodiscus cribrosus W.Sm.
Campylodiscus decorus Bréb.
Campylodiscus echensis Ehrenb.
Campylodiscus hibernicus Ehrenb.
Campylodiscus hibernicus var. ? [nom. illegit.]
Campylodiscus noricus Ehrenb.
Campylodiscus noricus var. hibernica (Ehrenb.) Grunow [orthographic error]
Campylodiscus noricus var. hibernicus (Ehrenb.) Grunow


Capartogramma crucicula (Grunow) Ross


Catacombus gaillonii (Bory) D.M.Williams & Round


Cavinula cocconeiformis (Greg. ex Grev.) D.G.Mann & Stickle in Round, Crawford & Mann
Cavinula intractata (Hust.) Lange-Bert. in Lange-Bert. & Metzeltin
Cavinula jaernefeltii (Hust.) D.G.Mann & Stickle in Round, Crawford & Mann
Cavinula lacustris (Greg.) D.G.Mann & Stickle in Round, Crawford & Mann
Cavinula pseudoscutiformis (Hust.) D.G.Mann & Stickle in Round, Crawford & Mann
Cavinula scutelloides (W.Sm.) Lange-Bert. in Lange-Bert. & Metzeltin
Cavinula scutiformis (Grunow ex A.Schmidt) D.G.Mann & Stickle in Round, Crawford & Mann
Cavinula variostriata (Krasske) D.G.Mann & Stickle in Round, Crawford & Mann


Ceratoneis arcus (Ehrenb.) Kütz. (see note 9)
Ceratoneis arcus var. amphioxys (Rabenh.) Brun


Chamaepinnularia begeri (Krasske) Lange-Bert.
Chamaepinnularia soehrensis (Krasske) Lange-Bert.
Chamaepinnularia mediocris (Krasske) Lange-Bert.
Chamaepinnularia evanida (Hust.) Lange-Bert.


Chaetoceros hohnii Graebn. & Wujek
Chaetoceros muelleri var. subsalsum J.R.Johans. & Rushforth
Chaetoceras sp.


Cocconeis diminuta Pant.
Cocconeis diminuta var. aegagropilae Murobuse
Cocconeis diruptoides Hust.
Cocconeis disculus (Schum.) Cleve
Cocconeis disculus var. diminuta (Pant.) A.Cleve
Cocconeis flexella (Kütz.) Cleve
Cocconeis flexulla (Kütz.) Cleve [orthographic error]
Cocconeis fluviatilis Wallace
Cocconeis japonica A.W.F.Schmidt
Cocconeis lineata Ehrenb.
Cocconeis neodiminuta Krammer in Krammer & Lange-Bert.
Cocconeis pediculus Ehrenb.
Cocconeis placentula Ehrenb.
Cocconeis placentula var. euglypta (Ehrenb.) Grunow
Cocconeis placentula var. klinoraphis Geitler
Cocconeis placentula var. lineata (Ehrenb.) VanHeurck
Cocconeis placentula var. rouxii (Hérib. & Brun) Cleve
Cocconeis rouxii Hérib. & Brun
Cocconeis schlettum [orthographic error]
Cocconeis rhombea Ehrenb.
Cocconeis scutellum Ehrenb.
Cocconeis scutellum var. japonica (A.W.F.Schmidt) Skvortzov
Cocconeis scutellum var. parva (Grunow) Cleve
Cocconeis thumensis A.Mayer
Cocconeis thwaitesii W.Sm.
Cocconeis transversalis Greg.


Cocconema cistula Hempr.
Cocconema cymbiforme (Kütz.) Ehrenb.
Cocconema fusidium Ehrenb.
Cocconema gastroides (Kütz.) Pell.
Cocconema lanceolatum Ehrenb.
Cocconema parva W.Sm.
Cocconema scotica W.Sm.


Colletonema lucustre VanHeurck


Comphonema constrictum Ehrenb. [orthographic error]


Coscinodiscus asteromorphus Ehrenb.
Coscinodiscus curvatalus Grunow
Coscinodiscus decrescens Grunow
Coscinodiscus lacustris Grunow
Coscinodiscus lanceolatum Ehrenb.
Coscinodiscus marginatus Ehrenb.
Coscinodiscus radiatus Ehrenb.
Coscinodiscus rothii (Ehrenb.) Grunow
Coscinodiscus rothii var. subsalsa (Juhl.-Dannf.) Hust.
Coscinodiscus subsalsa Juhl.-Dannf.
Coscinodiscus subsalsus Juhl.-Dannf. [orthographic error]
Coscinodiscus subtillis var. ? [nom. nud.]
Coscinodiscus tuberculatus Grev.
Coscinodiscus tuberculatus var. ? A.W.F.Schmidt [nom. illegit.]


Cosmioneis lundstroemii (Cleve in Cleve & Grunow) D.G.Mann in Round, Crawford & Mann
Cosmioneis pusilla (W.Sm.) D.G.Mann & Stickle in Round, Crawford & Mann


Craspedodiscus coscinodiscus Ehrenb.
Craspedodiscus microdiscus Ehrenb.


Craticula accomoda (Hust.) D.G.Mann in Round, Crawford & Mann
Craticula ambigua (Ehrenb.) D.G.Mann in Round, Crawford & Mann
Craticula cuspidata (Kütz.) D.G.Mann in Round, Crawford & Mann
Craticula cuspidata var. major (F.Meister) Czarn.
Craticula halophila (Grunow) D.G.Mann in Round, Crawford & Mann
Craticula subhalophila (Hust.) Lange-Bert.
Craticula vixvisibilis (Hust.) Lange-Bert.


Ctenophora pulchella (Ralfs ex Kütz.) D.M.Williams & Round
Ctenophora pulchella var. lacerata (Hust.) Bukht.
Ctenophora pulchella var. lanceolata (O'Meara) Bukht.


Cyclostephanos costatilumbus (Kob. & Kob.) Stoermer, Håk. & Theriot.
Cyclostephanos dubius (Fricke) Round in Theriot, Håkansson, Kociolek, Round & Stoermer
Cyclostephanos invisitatus (Hohn & Hellerm.) Theriot, Stoermer & Håk.
Cyclostephanos tholiformis Stoermer, Håk. & Theroit


Cyclotella americana Fricke
Cyclotella antiqua W.Sm.
Cyclotella atomus Hust.
Cyclotella bodanica Eulenst.
Cyclotella bodanica-comta Eulenst.-(Ehrenb.) Kütz. [nom. illegit.]
Cyclotella bodanica var. michiganensis Skvortzov
Cyclotella bodanica var. stellata Skvortzov
Cyclotella caspia Grunow
Cyclotella catenata Brun
Cyclotella cavita [nom. nud.]
Cyclotella chaetoceras Lemm.
Cyclotella comensis Grunow
Cyclotella compta (Ehrenb.) Kütz. [orthographic error]
Cyclotella comta (Ehrenb.) Kütz.
Cyclotella comta var. bodanica Grunow
Cyclotella comta var. glabriuscula Grunow
Cyclotella comta var. oligactis (Ehrenb.) Grunow
Cyclotella comta var. radiosa Grunow
Cyclotella comta var. paucipunctata Grunow
Cyclotella cryptica Reimann, Lewin & Guillard
Cyclotella cyclopunctata Håk & Carter
Cyclotella delicatula Hust.
Cyclotella distinguenda Hust.
Cyclotella distinguenda var. unipunctata (Hust.) Håk.
Cyclotella dubia Hilse
Cyclotella facetia Hohn & Hellerm.
Cyclotella gamma Sovereign
Cyclotella glomerata Bachm.
Cyclotella glomerata-stelligera Bachmann-Cleve & Grunow [nom. illegit.]
Cyclotella krammeri Håk.
Cyclotella kuetzingiana Thwaites
Cyclotella kuetzingiana var. phanetophora Fricke [orthographic error]
Cyclotella kuetzingiana var. planetophora Fricke
Cyclotella kuetzingiana var. radiosa Fricke
Cyclotella kutzingiana Thwaites [orthographic error]
Cyclotella melosiroides (Kirchn.) Lemm.
Cyclotella meneghiniana Kütz.
Cyclotella meneghiniana fo. plana Fricke [orthographic error]
Cyclotella meneghiniana var. plana Fricke
Cyclotella meneghiniana var. stellulifera Cleve & Grunow
Cyclotella stelligera (Cleve & Grunow) VanHeurck
Cyclotella michiganianaSkvortzov
Cyclotella nana Hust.
Thalassiosira pseudonana Hasle & Heim.
Cyclotella ocellata Pant.
Cyclotella ocellata-kutzingiana [nom. illegit.]
Cyclotella operculata (C.Agardh) Kütz.
Cyclotella operculata var. unipunctata (Fricke) Hust.
Cyclotella operculata unipunctata (Fricke) Hust. [nom. illegit.]
Cyclotella planktonica Brunnth.
Cyclotella pseudostelligera Hust.
Cyclotella quadriiunta (Schroeter) Hust.
Cyclotella radiosa Grunow
Cyclotella rossii Håk.
Cyclotella rotula Kütz.
Cyclotella socialis Schutt
Cyclotella spinosa Schum.
Cyclotella stelligera (Cleve & Grunow) VanHeurck
Cyclotella striata (Kütz.) Grunow
Cyclotella striata var. bipunctata Fricke
Cyclotella strisignata Grunow [nom. nud.]
Cyclotella temperei M.Perag. & Hérib.
Cyclotella thienemannii var. minuscula Jurilj
Cyclotella ucculata Pant. [orthographic error]
Cyclotella wolterecki Hust.


Cymatopleura angulata Grev.
Cymatopleura apiculata W.Sm.
Cymatopleura cochlea Brun
Cymatopleura elliptica (Bréb. & Godey) W.Sm.
Cymatopleura elliptica var. hibernica (W.Sm.) VanHeurck
Cymatopleura elliptica fo. spiralis Boyer
Cymatopleura hibernica W.Sm.
Cymatopleura hibernica var. rhombica H.H.Chase
Cymatopleura solea (Bréb. & Godey) W.Sm.
Cymatopleura solea var. apiculata (W.Sm.) Ralfs
Cymatopleura solea var. clavata O.Müll.
Cymatopleura solea var. gracilis Grunow
Cymatopleura solea var. pfuhlii Torka
Cymatopleura solea var. subconstricta O.Müll.
Cymatopleura solea var. regula (Ehrenb.) Grunow
Cymatopleura spiralis H.H.Chase


Cymbella acutiuscula Cleve
Cymbella aequalis W.Sm.
Cymbella affinis Kütz.
Cymbella amphicephala Nägeli
Cymbella amphicephala var. subundulata Cleve
Cymbella anglica Lagerst.
Cymbella naviculiformis Auersw.
Cymbella angustata (W.Sm.) Cleve
Cymbella aspera (Ehrenb.) H.Perag.
Cymbella aspera var. minor (VanHeurck) Cleve
Cymbella austriaca Grunow
Cymbella brehmii Hust.
Cymbella caespitosa Brun
Cymbella cesatii (Rabenh.) Grunow ex A.W.F.Schmidt
Cymbella cistula (Ehrenb. in Hemprich & Ehrenb.) Kirchn. in Cohn
Cymbella cistula var. gibbosa Brun
Cymbella cistula var. maculata (Kütz.) VanHeurck
Cymbella cistula var. truncata Brun
Cymbella cuspidata Kütz.
Cymbella cuspidata fo. impressa Fusey
Cymbella cuspidata var. schulzii A.Cleve
Cymbella cymbiformis C.Agardh
Cymbella delicatula Kütz.
Cymbella designata Krammer in Krammer & Lange-Bert.
Cymbella diluviana (Krasske) Florin
Cymbella ehrenbergii Kütz.
Cymbella elginsis Krammer
Cymbella fonticolaÿ Hust.
Cymbella gastroides Kütz.
Cymbella gracilis (Rabenh.) Cleve
Cymbella hauckii VanHeurck
Cymbella hebridica Grunow
Cymbella helvetica Kütz.
Cymbella hustedtii Krasske
Cymbella hybrida Grunow
Cymbella inaequalis (Ehrenb.) Rabenh.
Cymbella incerta (Grunow) Cleve
Cymbella jordani Grunow
Cymbella lacustris (C.Agardh) Cleve
Cymbella laevis Nägeli ex Kütz.
Cymbella lanceolata (C.Agardh) C.Agardh
Cymbella lata Grunow
Cymbella latens Krasske
Cymbella leptoceros (Ehrenb.) Kütz.
Cymbella leptoceros var. rostrata Hust.
Cymbella leptocerus (Ehrenb.) VanHeurck [orthographic error]
Cymbella lunata W.Sm.
Cymbella maculata Kütz.
Cymbella mexicana (Ehrenb.) Cleve
Cymbella microcephala Grunow
Cymbella microcephala var. crassa C.W.Reimer
Cymbella minuta Hilse
Cymbella minuta var. pseudogracilis (Choln.) C.W.Reimer
Cymbella minuta var. silesiaca (Bleisch ex Rabenh.) C.W.Reimer
Cymbella minuta fo. latens (Krasske) C.W.Reimer
Cymbella moelleriana Grunow
Cymbella muelleri Hust.
Cymbella muelleri fo. ventricosa (Temp. & M. Perag.) C.W.Reimer
Cymbella naviculiformis Auersw. ex Heib.
Cymbella norvegica Grunow
Cymbella obtusa Greg.
Cymbella obtusiuscula Kütz.
Cymbella parva (W.Sm.) Wolle
Cymbella parvula Krasske
Cymbella pediculus Kütz.
Cymbella prostrata (Berk.) Cleve
Cymbella prostrata var. auerswaldii (Rabenh.) C.W.Reimer
Cymbella prostrata var. caespitosa [nom. illegit.]
Cymbella proxima C.W.Reimer
Cymbella pusilla Grunow
Cymbella rabenhorstii Ross
Cymbella rhombiodea Boyer [orthographic error]
Cymbella rotundata H.H.Chase
Cymbella rugosa Hust.
Cymbella ruttneriHust.
Cymbella ruttneri var. obtusa Hust.
Cymbella scotica W.Sm.
Cymbella similis Krasske
Cymbella sinuata Greg.
Cymbella sinuata var. ovata Hust. [nom. illegit.]
Cymbella sinuata fo. antiqua (Grunow) C.W.Reimer
Cymbella sinuata fo. ovata (Hust.) Hust.
Cymbella sinuata var. antiqua (Grunow) Cleve
Cymbella stomatophora Grunow
Cymbella subaequalis Grunow
Cymbella subaequalis fo. krasskei (Foged) C.W.Reimer
Cymbella subventricosa Choln.
Cymbella triangularis (Ehrenb.) Cleve [orthographic error]
Cymbella triangulum (Ehrenb.) Cleve
Cymbella tumida (Bréb.) VanHeurck
Cymbella tumidula Grunow
Cymbella turgida Greg.
Cymbella turgida var. pseudogracilis Choln.
Cymbella turgidula Grunow
Cymbella ventricosa C.Agardh (see note 34)
Encyonema silesacum (Bleisch in Rabenh.) D.G.Mann in Round, Crawford & Mann pro parte
Encyonema minutum (Hilse in Rabenh.) D.G.Mann in Round, Crawford & Mann pro parte


Cymbellonitzschia diluviana Hust.


Cyratopleura eliptica (Bréb. et Goday) W.Sm. [orthographic error]


Cystopleura gibba (Ehrenb.) Kuntze
Cystopleura turgida (Ehrenb.) Kuntze


Denticula elegans Kütz.
Denticula frigida Kütz.
Denticula lauta J.W.Bail.
Denticula tenuis Kütz.
Denticula tenuis var. crassula (Nägeli) W.West & G.S.West
Denticula tenuis var. frigida (Kütz.) Grunow
Denticula thermalis Kütz.


Diadesmis confervacea Kütz.
Diadesmis contenta (Grunow ex VanHeurck) D.G.Mann in Round, Crawford & Mann
Diadesmis contenta var. biceps (Arn. ms., Grunow in VanHeurck) Poulin
Diadesmis peregrina W.Sm.
Diadesmis perpusilla (Grunow) D.G.Mann in Round, Crawford & Mann


Diatoma anceps (Ehrenb.) Kirchn.
Diatoma anceps var. linearis M.Perag.
Diatoma ehrenbergii Kütz.
Diatoma elongata C.Agardh
Diatoma elongatum (Lyngb.) C.Agardh
Diatoma elongatum var. minor Grunow
Diatoma elongatum var. tenue (C.Agardh) VanHeurck
Diatoma elongatum var. tenuis (C.Agardh) VanHeurck
Diatoma hiemale (Roth) Heib.
Diatoma hiemale var. mesodon (Ehrenb.) Grunow
Diatoma tenue C.Agardh
Diatoma tenue elongatum [orthographic error]
Diatoma tenue var. elongarum Lyngb. [orthographic error]
Diatoma tenue var. elongatum Lyngb.
Diatoma tenue var. pachycephala Grunow
Diatoma tenue var. pachycephalum [orthographic error]
Diatoma tenuevar. pachycephala Grunow
Diatoma vulgare Bory
Diatoma vulgare var. breve Grunow
Diatoma vulgare var. ehrenbergii (Kütz.) Grunow
Diatoma vulgare var. grande (W.Sm.) Grunow
Diatoma vulgare var. linearis VanHeurck
Diatoma vulgare var. ovale (Fricke) Hust. [orthographic error]
Diatoma vulgare var. ovalis (Fricke) Hust.
Diatoma vulgare var. producta Grunow


Didymosphenia geminata (Lyngb.) M. Schmidt


Diploneis boldtiana Cleve
Diploneis domblittensis (Grunow) Cleve
Diploneis elliptica (Kütz.) Cleve
Diploneis elliptica var. ladogensis Cleve
Diploneis elliptica var. pygmaea A.Cleve
Diploneis finnica (Ehrenb.) Cleve
Diploneis interrupta (Kütz.) Cleve
Diploneis marginestriata Hust.
Diploneis oblongella (Nägeli) Ross
Diploneis oblongella var. genuina (Nägeli ex Kütz.) Ross
Diploneis oculata (Bréb.) Cleve
Diploneis ocellata Østrup
Diploneis ovalis (Hilse) Cleve
Diploneis papula (A.W.F.Schmidt) Cleve
Diploneis parma Cleve
Diploneis peterseni Hust.
Diploneis pseudovalis Hust.
Diploneis pseudoovalis Hust. [orthographic error]
Diploneis puella (Schum.) Cleve
Diploneis pupula (A.W.F.Schmidt) Cleve [orthographic error]
Diploneis smithii (Bréb.) Cleve
Diploneis smithii var. pumila (Grunow) Hust.
Diploneis subovalis Cleve


Ellerbeckia arenaria (Moore ex Ralfs) R.M.Crawford


Encyonema auerswaldii Rabenh.
Encyonema brehmii (Hust.) D.G.Mann in Round, Crawford & Mann
Encyonema caespitosum Kütz.
Encyonema gracile Rabenh.
Encyonema hebridica Grunow ex Cleve
Encyonema lacustre (C.Agardh) D.G.Mann in Round, Crawford & Mann
Encyonema latens (Krasske) D.G.Mann in Round, Crawford & Mann
Encyonema limula [nom. nud.]
Encyonema lunatum (W.Sm. in Grev.) VanHeurck
Encyonema minutum (Hilse ex Rabenh.) D.G.Mann in Round, Crawford & Mann
Encyonema minutum var. pseudogracilis (Choln.) Czarn.
Encyonema muelleri (Hust.) D.G.Mann in Round, Crawford & Mann
Encyonema muelleri fo. ventricosa (Temp. & M.Perag.) Czarn.
Encyonema norvegica (Grunow) Bukht.
Encyonema prostratum (Berk.) Kütz.
Encyonema rugosum (Hust.) D.G.Mann in Round, Crawford & Mann
Encyonema silesiacum (Bleisch ex Rabenh.) D.G.Mann in Round, Crawford & Mann
Encyonema triangulatum Kütz.
Encyonema triangulum (Ehrenb.) Kütz.
Encyonema turgidum (Greg.) Grunow
Encyonema ventricosa Kütz.
Encyonema ventricosum Kütz.


Entomoneis alata (Ehrenb.) Ehrenb.
Entomoneis ornata (J.W.Bail.) C.W.Reimer
Entomoneis paludosa (W.Sm.) C.W.Reimer


Epithemia adnata (Kütz.) Bréb.
Epithemia adnata var. minor (M.Perag. & Hérib.) R.M.Patrick
Epithemia adnata var. porcellus (Kütz.) R.M.Patrick
Epithemia adnata var. proboscidea (Kütz.) R.M.Patrick
Epithemia adnata var. saxonica (Kütz.) R.M.Patrick>/a>
Epithemia alpestris W.Sm.
Epithemia andrewsii Stoermer & Yang [nom. superf.]
Epithemia argus(Ehrenb.) Kütz.
Epithemia argusvar. alpestris Grunow
Epithemia argusvar. amphicephala Grunow
Epithemia argusvar. longicornis (Ehrenb.) Grunow
Epithemia emarginata Andrews
Epithemia frickei Krammer
Epithemia gibba (Ehrenb.) Kütz.
Epithemia gibba var. parallela Grunow
Epithemia gibba var. ventricosa (Kütz.) Grunow
Epithemia gibberula (Ehrenb.) Kütz.
Epithemia hyndmanni W.Sm.
Epithemia intermedia Fricke
Epithemia muelleri Fricke
Epithemia ocellata (Ehrenb.) Kütz.
Epithemia reicheltii Fricke
Epithemia smithii Carruthers
Epithemia sorex Kütz.
Epithemia surex Kütz. [orthographic error]
Epithemia turgida (Ehrenb.) Kütz.
Epithemia turgida var. granulata (Ehrenb.) Brun
Epithemia turgida var. plicata Meist.
Epithemia turgida var. westermannii (Ehrenb.) Grunow
Epithemia turgida var. zebrina (Ehrenb.) Rabenh.
Epithemia ventricosa Ehrenb.
Epithemia zebra (Ehrenb.) Kütz.
Epithemia zebra var. porcellus (Kütz.) Grunow
Epithemia zebra var. saxonica (Kütz.) Grunow


Eucocconeis depressa (Cleve) Hust.
Eucocconeis flexella (Kütz.) Cleve
Eucocconeis flexella var. alpestris (Brun) Hust.
Eucocconeis lapponica Hust. (see note 3)
Eucocconeis lapponica var. ninckei (C.W.Reimer) Stoermer & Yang
Eucocconeis lapponica var. ninckei (Guermeur & Mang.) M.B.Edlund
Eucocconeis minuta (Cleve) Cleve


Eunotia acus nomem nudum [orthographic error]
Eunotia arcubus Nörpel & Lange-Bert. in Lange-Bert.
Eunotia arcus Ehrenb.
Eunotia arcus var. bidens Grunow
Eunotia arcus var. fallax Hust.
Eunotia bidens Ehrenb.
Eunotia curvata (Kütz.) Lagerst.
Eunotia diodon Ehrenb.
Eunotia exigua (Bréb.) Rabenh.
Eunotia flexuosa Bréb. ex Kütz.
Eunotia flexuosa var. eurycephala Grunow
Eunotia formica Ehrenb.
Eunotia glacialis F.Meister
Eunotia gracilis (Ehrenb.) Rabenh.
Eunotia granulata Ehrenb.
Eunotia incisa W.Sm.
Eunotia inflata (Grunow) Norpel-Schempp & Lange-Bert. in Lange-Bertalot
Eunotia intermedia (Krasske) Norpel-Schempp & Lange-Bert. in Lange-Bertalot
Eunotia lunaris (Ehrenb.) Grunow
Eunotia lunaris var. excisa Grunow
Eunotia major (W.Sm.) Rabenh.
Eunotia major var. impressa (W.Sm.) Rabenh.
Eunotia microcephala Krasske
Eunotia monodan (Ehrenb.) W.Sm. [orthographic error]
Eunotia monodan var. major (W.Sm.) Hust. [orthographic error]
Eunotia monodon Ehrenb.
Eunotia monodon var. major (W.Sm.) Hust.
Eunotia monodontiforma Lange-Bert. & Nörpel in Lange-Bert.
Eunotia naegelii Migula
Eunotia parallela Ehrenb.
Eunotia pectinalis (O.Müll.) Rabenh.
Eunotia pectinalis var. minor (Kütz.) Rabenh.
Eunotia pectinalis var. undulata (Ralfs) Rabenh.
Eunotia pectinalis var. ventricosa Grunow
Eunotia pectinalis fo. minor (Dillwyn) Rabenh.
Eunotia perpusilla Grunow
Eunotia praerupta Ehrenb.
Eunotia praerupta var. bidens (Ehrenb.) Grunow
Eunotia praerupta var. inflata Grunow
Eunotia praerupta var. laticepsfo. curtaGrunow
Eunotia pseudolunaris Venkt.
Eunotia robusta var. tetraedon (Ehrenb.) Ralfs
Eunotia septentrionalis Østrup
Eunotia serra Ehrenb.
Eunotia serra var. diadema (Ehrenb.) R.M.Patrick
Eunotia tenella (Grunow) Hust.
Eunotia trinacria Krasske
Eunotia valida Hust.
Eunotia vanheurckii R.M.Patrick
Eunotia vanheurckii var. intermedia (Krasske) R.M.Patrick
Eunotia woleirotii (Kütz.) Rabenh.
Eunotia zebrina Ehrenb.


Fallacia fracta (Hust. ex Simonsen) D.G.Mann in Round, Crawford & Mann
Fallacia helensis (Schulz) D.G.Mann in Round, Crawford & Mann
Fallacia insociabilis (Krasske) D.G.Mann in Round, Crawford & Mann
Fallacia monoculata (Hust.) D.G.Mann in Round, Crawford & Mann
Fallacia omissa (Hust.) D.G.Mann in Round, Crawford & Mann
Fallacia pseudomuralis (Hust.) D.G.Mann in Round, Crawford & Mann
Fallacia pygmaea (Kütz.) D.G.ManninRound, Crawford & Mann
Fallacia subhamulata (Grunow in VanHeurck) D.G.Mann in Round, Crawford & Mann
Fallacia submitis (Hust.) D.G.Mann in Round, Crawford & Mann


Fragellaria crotonensis Kitton [orthographic error]


Fragilaria acuta Ehrenb.
Fragilaria arcus (Ehrenb.) Cleve
Fragilaria atomus Hust.
Fragilaria bicapitata A.Mayer
Fragilaria bipunctata Ehrenb.
Fragilaria brevistriata Grunow in VanHeurck
Fragilaria brevistriata var. binodis (Pant.) A.Cleve
Fragilaria brevistriata var. capitata Hérib.
Fragilaria brevistriata var. inflata (Pant.) Hust.
Fragilaria brevistriata var. subcapitata Grunow in VanHeurck [name illegitimate]
Fragilaria capucinaDesm.
Fragilaria capucina var. acuta (Ehrenb.) Rabenh.
Fragilaria capucina var. lanceolata Grunow
Fragilaria capucina var. mesolepta Rabenh.
Fragilaria constricta Ehrenb.
Fragilaria constricta fo. stricta (A.Cleve) Hust.
Fragilaria construens (Ehrenb.) Grunow
Fragilaria construens var. bigibba A.Cleve
Fragilaria construens var. binodes (Ehrenb.) Grunow [orthographic error]
Fragilaria construens var. binodis (Ehrenb.) Grunow
Fragilaria construens var. capitata Hérib.
Fragilaria construens var. minuta Temp. & M.Perag.
Fragilaria construens var. pumila Grunow
Fragilaria construens var. subsalina Hust.
Fragilaria construens var. venter (Ehrenb.) Grunow
Fragilaria crotenensis Kitton [orthographic error]
Fragilaria crotonensis Kitton
Fragilaria crotonensis var. oregona Sovereign
Fragilaria crotonensis var. prolongata Grunow
Fragilaria crotonensis var. tenuissima [nom. nud.]
Fragilaria entomon (Ehrenb.) Ehrenb.
Fragilaria gracillima Mayer
Fragilaria harrisonii Grunow
Fragilaria harrisonii var. dubia Grunow
Fragilaria harrisonii var. rhomboides Grunow
Fragilaria heideni Østrup
Fragilaria heideni var. istvanffyi (Pant.) Hust.
Fragilaria inflata (Heid.) Hust.
Fragilaria intermedia Grunow
Fragilaria intermedia var. continua A.Cleve
Fragilaria intermedia var. fallax (Grunow) A.Cleve
Fragilaria intermiedia var. fallax (Grunow) A.Cleve
Fragilaria intermedia var. lanceolata Fusey
Fragilaria kriegeriana Krasske
Fragilaria lapponica Grunow
Fragilaria leptostauron (Ehrenb.) Hust.
Fragilaria leptostauron var. dubia (Grunow) Hust.
Fragilaria leptostauron var. fossilis (Pant.) Reháková
Fragilaria leptostauron var. rhomboides (Grunow) Hust.
Fragilaria linearis Castracane
Fragilaria minuscula Grunow non D.M.Williams & Round (see note11)
Fragilaria mutabilis (W.Sm.) Grunow
Fragilaria mutabilis var. intercedens Grunow in VanHeurck
Fragilaria nitzschioides Grunow
Fragilaria pantocsekii var. binodis (Pant.) A.Cleve
Fragilaria parasitica (W.Sm.) Grunow
Fragilaria pinnata Ehrenb.
Fragilaria pinnata var. intercedens (Grunow in VanHeurck) Hust.
Fragilaria pinnata var. lancettula (Schum.) Hust.
Fragilaria radians (Kütz.) D.M.Williams & Round
Fragilaria rhomboides (Ehrenb.) DeToni [nom. nud.]
Fragilaria spinosa Skvortzov
Fragilaria vaucheriae(Kütz.) J.B.Petersen (see note 12)
Fragilaria vaucheriae var. capitellata (Grunow) R.M.Patrick
Fragilaria vaucheriae var. fallax Grunow
Fragilaria vaucheriae var. lanceolata A.Mayer
Fragilaria vaucheriae var. parvula (Kütz.) A.Cleve
Fragilaria vaucheriae var. truncata (Grev.) Grunow
Fragilaria virescens Ralfs
Fragilaria virescense [orthographic error]
Fragilaria virescens var. capitata Østrup
Fragilaria virescens var. mesolepta (Rabenh.) Schönf.
Fragilaria virescens var. oblongella Grunow


Fragilariaforma bicapitata (Mayer) D.M.Williams & Round
Fragilariaforma constricta (Ehrenb.) D.M.Williams & Round
Fragilariaforma constricta fo. stricta (A.Cleve) Poulin
Fragilariforma virescens (Ralfs) D.M.Williams & Round
Fragilariforma virescens var. capitata (Østrup) Czarn.


Fragilariopsis linearis (Castracane) Hust.


Frustulia erifuga Lange-Bert. & Krammer in Lange-Bertalot
Frustulia rhomboides (Ehrenb.) >DeToni
Frustulia rhomboides var. amphipleuroides (Grunow) Cleve in Cleve & Grunow
Frustulia rhomboides var. crassinervia (Bréb.) Ross
Frustulia rhomboides var. saxonica (Rabenh.) DeToni
Frustulia rhomboides var. viridula (Bréb.) Cleve
Frustulia saxonica Ehrenb.
Frustulia viridula (Bréb.) DeToni
Frustulia vulgaris (Thwaites) DeToni
Frustulia vulgaris var. capitata Krasske
Frustulia weinholdii Hust.


Gallionella distans Ehrenb.


Geissleria acceptata (Hust.) Lange-Bert. & Metzeltin in Lange-Bert.
Geissleria declivis (Hust.) Lange-Bert.
Geissleria decussis (Østrup) Lange-Bert. & Metzeltin in Lange-Bert.
Geissleria kriegeri (Krasske) Lange-Bert.>
Geissleria paludosa (Hust.) Lange-Bert. & Metzeltin in Lange-Bert.
Geissleria schoenfeldii (Hust.) Lange-Bert. & Metzetlin in Lange-Bert.
Geissleria similis (Krasske) Lange-Bert. & Metzeltin in Lange-Bert.
Geissleria tectissima (Lange-Bert.) Lange-Bert.
Geissleria thingvallae (Østrup) Metzeltin & Lange-Bert. in Lange-B


Gloeonema paradoxum Ehrenb.
Gloeonema triangulatum Ehrenb.


Gomphoneis eriense (Grunow) Skvortzov & Meyer
Gomphoneis geitleri Kociolek & Stoermer
Gomphoneis herculeana (Ehrenb.) Cleve
Gomphoneis herculeana var. robusta (Grunow) Cleve
Gomphoneis olivacea (Hornemann) Dawson ex Ross & Sims
Gomphoneis olivacea var. calcarea (Cleve) Poulin in Poulin, Hamilton & Proulx
Gomphoneis quadripunctata (Østrup) P.A.Dawson ex Ross & Sims
Gomphoneis quadripunctata var. cochleariformis Kociolek & Stoermer


Gomphonema abbreviatum C.Agardh
Gomphonema abbreviatum var. inflata Hust.
Gomphonema acuminatum Ehrenb.
Gomphonema acuminatum var. brebissonii (Kütz.) Cleve
Gomphonema acuminatum var. coronatum (Ehrenb.) Rabenh.
Gomphonema acuminatum var. intermedia Grunow
Gomphonema acuminatum var. laticeps Ehrenb.
Gomphonema acuminatum var. pusillum Grunow
Gomphonema acuminatum var. pussilum Grunow [orthographic error]
Gomphonema acuminatum var. sphaerophora [nom. illegit.]
Gomphonema acuminatum var. trigonocephalum (Ehrenb.) Grunow
Gomphonema acuminatum var. turris Ehrenb. (see note 13)
Gomphonema affine Kütz.
Gomphonema affine var. elongatum (Mayer) Millie & Lowe
Gomphonema affine var. insigne (Greg.) Andrews
Gomphonema americanum Ehrenb.
Gomphonema angustatum (Kütz.) Rabenh.
Gomphonema angustatum var. citera (Hohn & Hellerm.) R.M.Patrick
Gomphonema angustatum var. obtusatum (Kütz.) Grunow
Gomphonema angustatum var. productum Grunow
Gomphonema angustatum var. sarcophagus (Greg.) Grunow
Gomphonema angustatum var. sarcophagu fo. undulata [nom. illegit.]
Gomphonema angustatum var. undulata Grunow
Gomphonema angustatum fo. undulata Grunow
Gomphonema apuncto Wallace
Gomphonema augur Ehrenb.
Gomphonema bohemicum Reich. & Fricke
Gomphonema brasiliense Grunow
Gomphonema capitatum Ehrenb.
Gomphonema clevei Fricke
Gomphonema consector Hohn & Hellerm.
Gomphonema constrictum Ehrenb.
Gomphonema constrictum var. capitata (Ehrenb.) VanHeurck
Gomphonema coronatum Ehrenb
Gomphonema crenulata (Ehrenb.) Kütz. [nom. nud.]
Gomphonema curvatum Kütz.
Gomphonema dichotomum Kütz.
Gomphonema eriense Grunow
Gomphonema exilissima (Grunow) Lange-Bert. & Reichart in Lange-Bert.
Gomphonema geminata (Lyngb.) C.Agardh
Gomphonema germainii Kociolek & Stoermer
Gomphonema gracile Ehrenb. em. VanHeurck
Gomphonema gracile var. cymbelloides Grunow
Gomphonema gracile var. dicotoma (Kütz.) Grunow
Gomphonema gracilevar. naviculacea (W.Sm.) Cleve
Gomphonema grovei M.Schmidt
Gomphonema grovei var. lingulatum (Hust.) Lange-Bert. in Krammer & Lange-Bert.
Gomphonema grunowii R.M.Patrick
Gomphonema helveticum Brun
Gomphonema helveticum var. tenuis Hust.
Gomphonema herculeanum Ehrenb.
Gomphonema herculeanum var. robusta Grunow
Gomphonema intricatum Kütz. (see note 14)
Gomphonema intricatum var. dichotomum (Kütz.) Grunow
Gomphonema intricatum var. fossilis Pant.
Gomphonema intricatum var. pumila Grunow (see note 15)
Gomphonema intricatum var. vibrio (Ehrenb.) Cleve (see note 16)
Gomphonema lanceolatum Ehrenb.
Gomphonema lanceolatum var. insignis (Greg.) Cleve
Gomphonema laticeps Ehrenb.
Gomphonema leptocampum Kociolek & Stoermer
Gomphonema lingulatum Hust.
Gomphonema longiceps Ehrenb.
Gomphonema longiceps var. gracilis Hust. [nom. nud.]
Gomphonema longiceps var. montana (Schum.) Hust.
Gomphonema longiceps var. subclavatum Grunow
Gomphonema longiceps var. subclavatum fo. gracilis Hust.
Gomphonema longiceps fo. gracilis Hust.
Gomphonema manubrium M.Schmidt & Fricke
Gomphonema manubrium M.Schmidt & Fricke sensu Kociolek & Stoermer
Gomphonema montanum Schum.
Gomphonema obscurum (W.Sm.) J.W.Griff. & Henfr. [orthographic error]
Gomphonema olivaceoides Hust.
Gomphonema olivaceoides var. cochleariformis Mang.
Gomphonema olivaceoides var. densestriata Foged
Gomphonema olivaceoides var. hutchinsoniana R.M.Patrick
Gomphonema olivaceum (Lyngb.) Kütz.
Gomphonema olivaceum var. calcareum (Cleve) Cleve
Gomphonema olivaceum var. minutissimaHust.
Gomphonema olivaceum var. olivaceoides (Hust.) Lange-Bert. in Lange-Bert. & Krammer
Gomphonema olivacium (Lyngb.) Kütz. [orthographic error]
Gomphonema parvulum (Kütz.) Kütz.
Gomphonema parvulum var. exilissima Grunow
Gomphonema parvulum var. lagenula (Kütz.) Freng.
Gomphonema parvulum var. micropus (Kütz.) Cleve
Gomphonema parvulum var. subelliptica Cleve
Gomphonema productum Lange-Bert. & Reichardt in Lange-Bert.
Gomphonema pseudoaugur Lange-Bert.
Gomphonema pseudotenellum Lange-Bert.
Gomphonema pygmaeum Kociolek & Stoermer
Gomphonema quadripunctatum (Østrup) Wisl.
Gomphonema robustum Grunow
Gomphonema sarcophagus Greg.
Gomphonema semiapertum Grunow
Gomphonema sphaerophorum Ehrenb.
Gomphonema subclavata fo. gracilis (Hust.) Woodhead & Tweed
Gomphonema subclavatum (Grunow) Grunow
Gomphonema subclavatum fo. gracilis (Hust.) Woodhead & Tweed
Gomphonema subclavatum var. mexicanum [no author, see Kingston 1980] [nom. illegit.?] (see note 17)
Gomphonema subclavatum var. mustela (Ehrenb.) Cleve
Gomphonema longiceps Ehrenb.
Gomphonema submehleri Kociolek & Stoermer
Gomphonema subtile Ehrenb.
Gomphonema subtile var. sagitta (Schum.) Cleve
Gomphonema superiorensis Kociolek & Stoermer
Gomphonema tenellum Kütz.
Gomphonema tergestinum (Grunow) Fricke
Gomphonema trigonocephalum Ehrenb.
Gomphonema truncatum Ehrenb.
Gomphonema truncatum var. capitatum (Ehrenb.) R.M.Patrick in Patrick & Reimer
Gomphonema truncatum var. macilentum Kociolek & Stoermer
Gomphonema truncatum var. turgidum (Ehrenb.) R.M.Patrick in Patrick & Reimer
Gomphonema tumens Kociolek & Stoermer
Gomphonema turgidum Grunow
Gomphonema turris Ehrenb.
Gomphonema ventricosum Greg.
Gomphonema ventricosum Greg. sensu Kociolek & Stoermer 1987
Gomphonema vibrio Ehrenb.
Gomphonema vibrio var. fossile (Pant.) Ross
Gomphonema vibrio var. intricatum (Kütz.) Ross
Gomphonema vibrio var. pumilum (Grunow in VanHeurck) Ross


Gyrosigma acuminatum (Kütz.) Rabenh.
Gyrosigma attenuatum (Kütz.) Rabenh. Gyrosigma exilis (Grunow) C.W.Reimer
Gyrosigma eximium (Thwaites) Boyer
Gyrosigma kuetzingii (Grunow) Cleve(see note 18)
Gyrosigma macrum (W.Sm.) J.W.Griff & Henfr.
Gyrosigma nodiferum (Grunow) C.W.Reimer sensu Reimer in Patrick & Reimer
Gyrosigma nodiferum (Grunow) C.W.Reimer sensu Krammer & Lange-Bert.
Gyrosigma obscurum (W.Sm.) J.W.Griff. & Henfr.
Gyrosigma obtusatum (Sull. & Wormley) Boyer
Gyrosigma parkeri (M.B.Harrison) Elmore
Gyrosigma reimeri Sterrenb.
Gyrosigma scalproides (Rabenh.) Cleve
Gyrosigma sciotense (Sull. & Wormley) Cleve [historical orthographic error sciotoense vs. sciotense]
Gyrosigma sciotoense (Sull. & Wormley) Cleve
Gyrosigma spencerii (Quek.) J.W.Griff. & Henfr.
Gyrosigma spencerii var. curvula (Grunow) C.W.Reimer
Gyrosigma spencerii var. nodifera (Grunow) Cleve(see note 35)
Gyrosigma strigile (W.Sm.) Cleve
Gyrosigma strigilis (W.Sm.) Cleve
Gyrosigma temperei Cleve
Gyrosigma wormleyi (Sull.) Boyer


Hannaea arcus (Ehrenb.) R.M.Patrick (see note 9)
Hannaea arcus var. amphioxys (Rabenh.) R.M.Patrick
Hannaea arcus var. linearis Holmboe


Hantzschia amphioxys (Ehrenb.) Grunow (see note 19)
Hantzschia amphioxys var. capitata O.Müll.
Hantzschia amphioxys var. vivax (Hantzsch) Grunow
Hantzschia virgata (Roper) Grunow in Cleve & Grunow
Hantzschia virgata var. capitellata Hust.


Hippodonta capitata (Ehrenb.) Lange-Bert., Metzeltin & Witkowski
Hippodonta costulata (Grunow) Lange-Bert., Metzeltin & Witkowski
Hippodonta hungarica (Grunow) Lange-Bert., Metzeltin & Witkowski
Hippodonta linearis (Østrup) Lange-Bert., Metzeltin & Witkowski
Hippodonta lueneburgensis (Grunow) Lange-Bert., Metzeltin & Witkowski
Hippodonta subcostulata (Hust.) Lange-Bert., Metzeltin & Witkowski


Homoeocladia sigmoidea (Nitzsch.) Elmore


Hyalosynedra laevigata (Grunow) D.M.Williams & Round


Karayevia clevei (Grunow in Cleve & Grunow) Bukht. & Round
Karayevia laterostrata (Hust.) Bukht. & Round


Kobayasia jaagii (F.Meister) Lange-Bert.
Kobayasia subtilissima (Cleve) Lange-Bert.


Kolbesia kolbei (Hust.) Bukht. & Round
Kolbesia ploenensis (Hust.) Bukht. & Round


Krasskella kriegerana (Krasske) Ross & Sims


Luticola mutica (Kütz.) D.G.Mann in Round, Crawford & Mann
Luticola cohnii (Hilse) D.G.Mann in Round, Crawford & Mann
Luticola muticoides (Hust.) D.G.Mann in Round, Crawford & Mann
Luticola muticopsis (VanHeurck) D.G.Mann in Round, Crawford & Mann


Lysigonium granulata (Ehrenb.) Kuntze
Lysigonium varians (C.Agardh) DeToni


Martyana martyi (Hérib.) F.E.Round in Round, Crawford & Mann


Mastogloia braunii Grunow
Mastogloia grevillei W.Sm.
Mastogloia lacustris (Grunow) VanHeurck
Mastogloia smithii Thwaites
Mastogloia smithii var. amphicephala Grunow
Mastogloia smithii var. lacustris Grunow


Melosira agassizii Ostenf.
Melosira agassizii var. malayensis Hust.
Melosira ambigua (Grunow) O.Müll.
Melosira arenaria Moore ex Ralfs
Melosira binderana Kütz.
Melosira canadensis Hust.
Melosira crenulata (Ehrenb.) Kütz.(see note 20)
Melosira crenulata var. tenuis Kütz. (see note 20)
Melosira crotonensis (J.W.Bail.) H.L.Sm.
Melosira dickei (Thwaits) Kütz.
Melosira distans (Ehrenb.) Kütz.
Melosira distans var. alpigena Grunow
Melosira distans var. limnetica O.Müll.
Melosira granulata (Ehrenb.) Ralfs
Melosira granulata var. angustissima O.Müll.
Melosira granulata var. angustissima fo. curvata Grunow
Melosira granulata var. angustissima fo. spiralis O.Müll.
Melosira granulata var. muzzanensis (F.Meister) Bethge
Melosira granulata fo. curvata Grunow
Melosira granulata fo. spiralis Grunow
Melosira granulata status ÿ (O.Müll.) Hust. [nom. illegit]
Melosira granulate [orthographic error]
Melosira islandica O.Müll.
Melosira islandica subsp. helvetica O.Müll.
Melosira islandica-ambigua O.Müll. (Grunow) O.Müll. [nom. illegit.]
Melosira italica (Ehrenb.) Kütz.
Melosira italica var. tenuis (Grunow) O.Müll.
Melosira italica var. tenuissima (Grunow) O.Müll.
Melosira italica var. valida Grunow
Melosira italica subsp. subarctica O.Müll.
Melosira lacustris H.H.Chase [nom. nud.]
Melosira longispina Hust.
Melosira roseana Rabenh.
Melosira dendroteres (Rabenh.) Ross
Orthoseira dendroteres (Rabenh.) R.M.Crawford (see note 21)
Melosira undulata (Ehrenb.) Kütz.
Melosira undulata var. normanii Arn.
Melosira varians C.Agardh


Meridion anceps (Ehrenb.) D.M.Williams
Meridion circulare (Grev.) C.Agardh
Meridion circulare var. constrictum (Ralfs) VanHeurck
Meridion constrictum Ralfs
Meridion intermedium H.L.Sm.
Meridion intermedium var. constrictum H.L.Sm.
Meridion vernale C.Agardh


Microsiphona potamos Weber


Navicula aboensis (Cleve) Hust.
Navicula abiskoensis Hust.
Navicula absoluta Hust.
Navicula acceptata Hust.
Navicula accomoda Hust.
Navicula affinis Ehrenb.
Navicula agnita Hust.
Navicula aikensis R.M.Patrick
Navicula ambigua Ehrenb.
Navicula ambigua var. craticularis Ehrenb.
Navicula americana Ehrenb.
Navicula americana var. alastis Hohn & Hellerm.
Navicula amphibola Cleve
Navicula amphibola var.perrieri M.Perag. & Hérib.
Navicula amphibola var.polymorpha Fusey
Navicula amphiceros Kütz.
Navicula amphigomphus Ehrenb.
Navicula amygdalina Hust.
Navicula anatis Hohn & Hellerm.
Navicula anglica Ralfs sensu Hust.
Navicula anglica var. signata Hust.
Navicula anglica var. subsalsa (Grunow) Cleve
Navicula angusta Grunow
Navicula angustata W.Sm.
Navicula appendiculata (C.Agardh) Kütz.
Navicula arvensis Hust.
Navicula atomus (Kütz.) Grunow
Navicula atomus var. permitis (Hust.) Lange-Bert.
Navicula atomus var. recondita (Hust.) Lange-Bert.
Navicula aurora Sovereign
Navicula bacillaris Greg.
Navicula bacilliformis Grunow
Navicula bacillum Ehrenb.
Navicula bacillium Ehrenb. [orthographic error]
Navicula bacillus [orthographic error]
Navicula balcanica Hust.
Navicula begeri Krasske
Navicula bicapitata Lagerst.
Navicula bicapitellata Hust.
Navicula bicephala Hust.
Navicula bicontracta Østrup
Navicula binodis Ehrenb.
Navicula brebissonii Kütz.
Navicula bryophila J.B.Peters.
Navicula campylogramma Ehrenb.
Navicula canalis R.M.Patrick
Navicula capitata Ehrenb.
Navicula capitata var. hungarica (Grunow) Ross
Navicula capitata var. linearis (Østrup) Stoermer & Kreis
Navicula capitata var. lueneburgensis (Grunow) R.M.Patrick
Navicula capitata var. lueneburgensis fo. elegans Østrup
Navicula capitata var. lunenbergensis fo. elegans Østrup [orthographic error]
Navicula capitatoradiata Germain
Navicula capsa Hohn
Navicula cardinalis Ehrenb.
Navicula cari Ehrenb. (see note 22)
Navicula cari var. angusta Grunow
Navicula caroliniana R.M.Patrick
Navicula cascadensis Sovereign
Navicula castutata [Orthographic error]
Navicula certa Hust. (non F.Meister 1934)
Navicula cincta (Ehrenb.) Ralfs
Navicula cincta var. rostrata C.W.Reimer
Navicula circumtexta F.Meister
Navicula citrus Krasske
Navicula clamans Hust.
Navicula clementis Grunow
Navicula clementis var. linearis Brander
Navicula clementis var. quadristigmata Mang.
Navicula clementoides Hust.
Navicula cocconeiformis Greg. ex Grev.
Navicula confervacea (Kütz.) Grunow
Navicula confervacea var. peregrina (W.Sm.) Grunow
Navicula constans var. symmetrica Hust.
Navicula contenta Grunow
Navicula contenta var. biceps (Arn. ms., Grunow in VanHeurck) Cleve
Navicula contraria R.M.Patrick
Navicula costulata Grunow in Cleve & Grunow
Navicula costuloides Skvortzov
Navicula crucicula (W.Sm.) Donk.
Navicula cryptocefalsa Lange-Bert.
Navicula cryptocephala Kütz.
Navicula cryptocephala var. exilis (Kütz.) Grunow
Navicula cryptocephala var. intermedia VanHeurck
Navicula cryptocephala var. lancettula (Schum.) Grunow
Navicula cryptocephala var. veneta (Kütz.) Rabenh.
Navicula cryptocephaloides Hust.
Navicula cryptotenella Lange-Bert.
Navicula cuspidata (Kütz.) Kütz.
Navicula cuspidata var. ambigua (Ehrenb.) Cleve
Navicula cuspidata var. major F.Meister
Navicula declivis Hust.
Navicula decussis Østrup
Navicula densestriata Hust.
Navicula detenta Hust.
Navicula dicephala Ehrenb.
Navicula dicephala var. abiskonensis (Hust.) A.Cleve
Navicula dicephala var.elginensis (Greg.) Cleve
Navicula dilata Ehrenb.
Navicula diluviana Krasske
Navicula disputans R.M.Patrick
Navicula dissipata Hust.
Navicula distinctastriata Hohn & Hellerm.
Navicula divergens(W.Sm.) Ralfs
Navicula dubia Ehrenb.
Navicula dulcis Krasske
Navicula elegans W.Sm.
Navicula elginensis (Greg.) Ralfs
Navicula elginensis var. lata (M.Perag.) R.M.Patrick
Navicula elginensis var. neglecta (Krasske) R.M.Patrick
Navicula elginensis var. rostrata (A.Mayer) R.M.Patrick
Navicula elliptica Kütz.
Navicula elliptica var. minutissima Grunow
Navicula excelsa Krasske
Navicula exigua (Greg.) Grunow
Navicula exigua var. capitata R.M.Patrick
Navicula exiguiformis Hust.
Navicula exiguoides Hust.
Navicula exilis Kütz.
Navicula explanata Hust.
Navicula farta Hust.
Navicula festiva Krasske
Navicula fracta Hust.
Navicula gastriformis Hust.
Navicula gastrum (Ehrenb.) Kütz.
Navicula gastrum var. signata Hust.
Navicula gibba (Ehrenb.) Kütz.
Navicula gibbosa Hust.
Navicula globiceps Greg.
Navicula globosa F.Meister
Navicula goeppertiana (Bleisch) H.L.Smith
Navicula gottlandica Grunow
Navicula gracilis Ehrenb.
Navicula gracilis var. schizonemoides VanHeurck
Navicula graciloides A.Mayer
Navicula graciloides A.Mayer sensu Hust.
Navicula gregaria Donk.
Navicula grimmei Krasske
Navicula gysingensis Foged
Navicula halophila (Grunow) Cleve
Navicula halophila fo. tenuirostris Hust.
Navicula hambergii Hust.
Navicula hantzschia [orthographic error]
Navicula hassiaca Krasske
Navicula hasta Pant.
Navicula helensis Schulz
Navicula hemiptera Kütz.
Navicula heufleri Grunow
Navicula heufleri var. leptocephala (Bréb.) R.M.Patrick
Navicula hitchcockii Ehrenb.
Navicula hungarica Grunow
Navicula hungarica var. capitata (Ehrenb.) Cleve
Navicula hungarica var. linearis Østrup
Navicula hustedtii Krasske
Navicula hustedtii fo. obtusa (Hust.) Hust. (see note 23)
Navicula imbricata Bock
Navicula importuna Hust.
Navicula incerta Grunow
Navicula inflata Donk.
Navicula inflexa (Greg.) Ralfs
Navicula ingenua Hust.
Navicula ingrata Krasske
Navicula insignita Hust.
Navicula insociabilis Krasske
Navicula insociabilis var. dissipatoides Hust.
Navicula integra (W.Sm.) Ralfs
Navicula interglacialis Hust.
Navicula intractata Hust.
Navicula iridis Ehrenb.
Navicula iridis var. affinis VanHeurck
Navicula iridis var. amphigomphus Ehrenb.
Navicula iridis var. amphirhynchus Ehrenb.
Navicula iridis var. firma W.Sm.
Navicula iridis var. producta W.Sm.
Navicula jaagii F.Meister
Navicula jaernefeltii Hust.
Navicula jarnfeldtii Hust. [Orthographic error]
Navicula jentzschii Grunow
Navicula kotschyi Grunow (see note 24)
Navicula krasskei Hust.
Navicula kriegeri Krasske
Navicula lacunarum Grunow
Navicula lacustris Greg.
Navicula laevissima Kütz.
Navicula ladogensis Cleve
Navicula laevissima Kütz.
Navicula lanceolata (C.Agardh) Kütz. (see note 25)
Navicula lanceolata var. cymbula (Donk.) Cleve
Navicula lanceolata var. tenuirostris Skvortzov
Navicula latens Krasske
Navicula lateropunctata Wallace
Navicula laterostrata Hust.
Navicula lenzii Hust.
Navicula levanderi Hust.
Navicula limosa Kütz.
Navicula limosa var. gibberula (Kütz.) Grunow
Navicula limosa var. subinflata Grunow
Navicula limosa var. undulata Grunow
Navicula longa Ralfs
Navicula longirostris Hust. (see note 26)
Navicula lundstroemii Cleve
Navicula lundstromii (no authority cited), [orthographic error]
Navicula luzonensis Hust.
Navicula maculata Hust.
Navicula major Kütz.
Pinnularia major (Kütz.) Rabenh.
Navicula maxima Greg.
Navicula mediocris Krasske
Navicula menisculoides Hust.
Navicula menisculus Schum.
Navicula menisculus var. krenneri A.Cleve
Navicula menisculus var. obtusa Hust.
Navicula menisculus var. upsaliensis (Grunow in Cleve & Grunow) Grunow in VanHeurck
Navicula meniscus Schum.
Navicula mesolepta Ehrenb.
Navicula mesolepta var. ? Ehrenb. [nom. illegit.]
Navicula micropupula Choln.
Navicula minima Grunow
Navicula minimavar. okamurae Skvortzov
Navicula minnewaukonensis Elmore
Navicula minuscula Grunow
Navicula minuscula var. alpestris Hust.
Navicula minusculoides Hust.
Navicula monoculata Hust.
Navicula muraliformis Hust.
Navicula muralis Grunow
Navicula mutica Kütz.
Navicula mutica var. cohnii (Hilse) Grunow
Navicula mutica var. nivalis (Ehrenb.) Hust.
Navicula mutica var. tropica Hust.
Navicula mutica var. undulata (Hilse) Grunow
Navicula muticoides Hust.
Navicula muticopsis VanHeurck
Navicula neoventricosa Hust.
Navicula nobilis (Ehrenb.) Kütz.
Navicula notha Wallace
Navicula nyassensis O.Müll.
Navicula nyassensis fo. minor O.Müll.
Navicula obdurata Hohn & Hellerm.
Navicula oblonga (Kütz.) Kütz.
Navicula oblongum var. subcapitata Pant.
Navicula odiosa Wallace
Navicula omissa Hust.
Navicula opportuna Hust.
Navicula oppugnata Hust.
Navicula ordinaria Hust.
Navicula paanaensis A.Cleve
Navicula paca Hohn & Hellerm.
Navicula paludosa Hust.
Navicula parva Ralfs
Navicula paucivisitata R.M.Patrick
Navicula pelliculosa Hilse
Navicula peratomus Hust.
Navicula peregrina (Ehrenb.) Kütz.
Navicula permitis Hust.
Navicula perpusilla (Kütz.) Grunow
Navicula perrotettii (Grunow) Cleve
Navicula perrotettii var. enervis Hust.
Navicula placenta Ehrenb.
Navicula placentula (Ehrenb.) Kütz.
Navicula placentula var. rostrata A.Mayer
Navicula platycephala O.Müll.
Navicula platystoma Ehrenb.
Navicula platystoma var. pantocsekii Wislouch & Kolbe
Navicula porifera var. opportuna (Hust.) Lange-Bert. in Krammer & Lange-Bert.
Navicula potzgeri C.W.Reimer
Navicula praeterita Hust.
Navicula praterita [orthographic error]
Navicula producta W.Sm.
Navicula protracta (Grunow) Cleve
Navicula protracta var. elliptica Gallik
Navicula protracta fo. subcapitata (Wislouch & V.S.Poretzsky) Hust.
Navicula pseudanglica Lange-Bert.
Navicula pseudobacillum Grunow
Navicula pseudoclementis Hust.
Navicula pseudomuralis Hust.
Navicula pseudoreinhardtii R.M.Patrick
Navicula pseudoscutiformis Hust.
Navicula pseudoventralis Hust.
Navicula punctata Donk.
Navicula pupla [orthographic error]
Navicula pupula Kütz.
Navicula pupula var. aquaeductae (Krasske) Hust.
Navicula pupula var. bacillariodes Grunow
Navicula pupula var. capitata Hust.
Navicula pupula var. elliptica Hust.
Navicula pupula var. mutata (Krasske) Hust.
Navicula pupula var. rectangularis (W.Greg.) Grunow
Navicula pupula var. rostrata Hust.
Navicula pusilla W.Sm.
Navicula pygmaea Kütz.
Navicula pygmaea var. producta [nom. nud.]
Navicula quadripartita Hust.
Navicula radiosa Kütz.
Navicula radiosa var. intermedia [nom. nud.]
Navicula radiosa var. parva Wallace
Navicula radiosa var. tenella (Bréb.ex Kütz.) Grunow in VanHeurck
Navicula radiosafallax Lange-Bert.
Navicula recondita Torka
Navicula reinhardtii Grunow
Navicula reinhardtii var. elliptica Hérib.
Navicula rhomboides Grunow
Navicula rhynchocephala Kütz.
Navicula rhynchocephala var. amphiceros (Kütz.) Grunow
Navicula rhynchocephala var. germainii (Wallace) R.M.Patrick
Navicula rhynchocephala var. germanii (Wallace) R.M.Patrick [orthographic error]
Navicula rhyncocephala Kütz. [orthographic error]
Navicula rhynchotella Lange-Bert.
Navicula rostellata Kütz.
Navicula rotaeana (Rabenh.) Grunow
Navicula rotaeana var. excentrica Grunow
Navicula rotunda Hust.
Navicula sabiniana R.M.Patrick
Navicula salinarum Grunow
Navicula salinarum var. intermedia (Grunow) Cleve
Navicula saugerii Desm.
Navicula schmassmannii Hust.
Navicula schoenfeldii Hust.
Navicula schroeteri var. escambia R.M.Patrick
Navicula schumanniana Grunow
Navicula sculpta Ehrenb.
Navicula scutelloides W.Sm.
Navicula scutiformis Grunow
Navicula secreta Pant.
Navicula secura R.M.Patrick
Navicula semen Ehrenb. Navicula semenoides Hust.
Navicula seminuloides Hust.
Navicula seminulum Grunow
Navicula seminulum var. hustedtii R.M.Patrick
Navicula seminulum var. intermedia Hust.
Navicula serians Kütz.
Navicula sigma Ehrenb.
Navicula similis Krasske
Navicula simplex Krasske
Navicula skabitschewskyi Sabelina
Navicula smithii Bréb.
Navicula sovereignae Hust.
Navicula sphaerophora Kütz.
Navicula splendicula VanLand.
Navicula staurifera Thomas
Navicula stauroptera var. parva (Ehrenb.) Grunow (see note 27)
Navicula stroemii Hust.
Navicula stroesei (Østrup) A.Cleve
Navicula subbacillum Hust.
Navicula subclementis Hust.
Navicula subcostulata Hust.
Navicula subgastriformis Hust.
Navicula subhalophila Hust.
Navicula subhamulata Grunow in VanHeurck
Navicula subhamulata var. undulata Hust.
Navicula submitis Hust.
Navicula submuralis Hust.
Navicula subocculta Hust.
Navicula subocculata Hust. [orthographic error]
Navicula subrhynchocephala Hust.
Navicula subrotundata Hust.
Navicula subrotundata fo. lanceolata Hust.
Navicula subseminulum Hust.
Navicula subsulcata Hust.
Navicula subtilissima Cleve
Navicula symmetrica R.M.Patrick
Navicula tabellaria (Ehrenb.) Kütz.
Navicula tantula Hust.
Navicula tecta Krasske
Navicula tenella (Bréb.) VanHeurck
Navicula tenera Hust.
Navicula termes Ehrenb. (see note 28)
Navicula terminata Hust.
Navicula texana R.M.Patrick
Navicula tridentula Krasske
Navicula tridentula var. parallela Krasske
Navicula trinodis Lewis
Navicula tripunctata (O.F.Müll.) Bory
Navicula tripunctata var. cuneata (Lauby) Stoermer & Yang
Navicula tripunctata var. schizonemoides (VanHeurck) R.M.Patrick
Navicula trochus Schum. (non. Ehrenb. 1838)
Navicula tumida W.Sm.(see note 29)
Navicula tuscula Ehrenb.
Navicula tuscula var. angulata Hust.
Navicula tuscula fo. minor Hust.
Navicula tuscula fo. obtusa Hust.
Navicula tuscula fo. rostrata Hust.
Navicula tuscula var. rostrata Hust.
Navicula vanheurckii R.M.Patrick
Navicula varians Greg.
Navicula variostriata Krasske
Navicula vaucheriae J.B.Peters.
Navicula ventosa Hust.
Navicula ventralis Krasske
Navicula ventralis fo. simplex Hust.
Navicula verecundaHust.
Navicula viridis(Nitzsch.) Ehrenb.
Navicula viridula(Kütz.) Ehrenb.
Navicula viridula var. avenacea (Bréb.) VanHeurck
Navicula viridula var. germainii (Wallace) Lange-Bert.
Navicula viridula var. linearis Hust.
Navicula viridula var. rostellata (Kütz.) Cleve
Navicula viridula var. tenella [orthographic error]
Navicula vitabunda Hust.
Navicula vulpina Kütz.
Navicula vulpina var. avenacea (Van Heurck) R.M.Patrick
Navicula wittrockii (Lagerst.) Temp. & M.Perag.
Navicula zanoni Hust.
Navicula zanoii Hust. [orthographic error]


Neidium affine (Ehrenb.) Pfitz.
Neidium affine var. amphirhynchus ( Ehrenb.) Cleve
Neidium affine var. capitata Mölder
Neidium affine var. ceylonicum ( Skvortsov) C.W.Reimer
Neidium affine var. hankense (Skvortsov) C.W.Reimer
Neidium affine var. humerus C.W.Reimer
Neidium affinevar. undulatum (Grunow) Cleve
Neidium amphigomphus (Ehrenb.) Pfitz.
Neidium ampliatum (Ehrenb.) Krammer in Krammer & Lange-Bert.
Neidium apiculatum C.W.Reimer
Neidium binode (Ehrenb.) Hust.
Neidium bisulcatum (Lagerst.) Cleve
Neidium bisulcatum var. baicalense (Skvortsov & K.I.Mey.) C.W.Reimer
Neidium bisulcatum var. undulatum O. Müll.
Neidium bisulcatum var. subundulatum (Grunow) C.W.Reimer in Patrick & Reimer
Neidium calvum Østrup
Neidium dilatatum (Ehrenb.) Cleve
Neidium distincte-punctatum Hust.
Neidium dubium (Ehrenb.) Cleve
Neidium dubium fo. constrictum (Hust.) Hust.
Neidium hankensis Skvortsov
Neidium hitchcockii (Ehrenb.) Cleve
Neidium iridis (Ehrenb.) Cleve
Neidium iridis var. amphigomphus (Ehrenb.) A.Mayer
Neidium iridis var. ampliatum (Ehrenb.) Cleve
Neidium iridis var. amplicata (Ehrenb.) Cleve [orthographic error]
Neidium iridis var. vernalis Reich.
Neidium kozlowi Meresch.
Neidium kozlowi var. baicalensis fo. robusta Stoermer
Neidium kozolwi Meresch. [orthographic error]
Neidium ladogense (Cleve) Stoermer & Yang
Neidium levanderi (Hust.) Lange-Bert. & Metzeltin in Lange-Bert.
Neidium mirum Krasske
Neidium productum (W.Sm.) Cleve
Neidium sacoense C.W.Reimer
Neidium temperei C.W.Reimer


Nitzschia accomodata Hust.
Nitzschia acicularioides Hust.
Nitzschia acicularioides sensu R.E.M.Archibald non Hust. 1930
Nitzschia acicularis (Kütz.) W.Sm.
Nitzschia acidoclinata Lange-Bert.
Nitzschia actinastroides (Lemm.) Van Goor
Nitzschia acula Hantzsch ex Cleve & Grunow
Nitzschia acuminata (W.Sm.) Grunow
Nitzschia acuta Cleve
Nitzschia adapta Hust.
Nitzschia agnewii Choln.
Nitzschia agnita Hust.
Nitzschia amphibia Grunow
Nitzschia amphibia var. fossilis Grunow
Nitzschia amphibia var. frauenfeldii Grunow
Nitzschia amphicephala Grunow
Nitzschia amphioxoides Hust.
Nitzschia amphioxys (Ehrenb.) W.Sm.
Nitzschia angustata (W.Sm.) Grunow
Nitzschia angustata var. acuta Grunow
Nitzschia angustatula Lange-Bert.
Nitzschia apiculata (Greg.) Grunow
Nitzschia archibaldii Lange-Bert.
Nitzschia bacata Hust.
Nitzschia bacata fo. linearis Hust.
Nitzschia bremensis Hust.
Nitzschia brevirostris Hust.
Nitzschia bulnheimiana (Rabenh.) H.L.Sm.
Nitzschia capitellata Hust.
Nitzschia circumsuta (Bail.) Grunow
Nitzschia clausii Hantzsch
Nitzschia closterium (Ehrenb.) W.Sm.
Nitzschia communis Rabenh.
Nitzschia communis var. abbreviata Grunow
Nitzschia commutata Grunow
Nitzschia confinis Hust.
Nitzschia debilis (Arn.) Grunow in Cleve & Grunow
Nitzschia delicatissima Cleve
Nitzschia denticula Grunow
Nitzschia diserta Hust.
Nitzschia dissidua [orthographic error]
Nitzschia dissipata (Kütz.) Grunow
Nitzschia dissipata var. borneensis Hust.
Nitzschia dissipata var. media (Hantzsch) Grunow
Nitzschia dissipata fo. undulata Sovereign
Nitzschia draveillensis Coste & Ricard
Nitzschia dubia W.Sm.
Nitzschia elegens Hust.
Nitzschia epiphytica Hust.
Nitzschia epiphyticoides Hust.
Nitzschia fasciculata Grunow
Nitzschia filiformis (W.Sm.) VanHeurck
Nitzschia filiformis var. conferta (Richart) Lange-Bert.
Nitzschia flexa Schum.
Nitzschia fluminenesis Grunow
Nitzschia fonticola Grunow
Nitzschia fonticola var. capitata A.Cleve
Nitzschia fonticola var. pelagica Hust.
Nitzschia fonticoloides Sovereign
Nitzschia frustulum (Kütz.) Grunow
Nitzschia frustulum (Kütz.) Grunow sensu Lange-Bert.
Nitzschia frustulum var. minuta Grunow in VanHeurck [orthographic error]
Nitzschia frustulum var. minutula Grunow in Van Heurck
Nitzschia frustulum var. perminuta Grunow
Nitzschia frustulum var. perpusilla (Rabenh.) Grunow
Nitzschia frustulum var. subsalina Hust.
Nitzschia frustulum var. tenella Grunow
Nitzschia gandersheimiensis Krasske
Nitzschia gessneri Hust.
Nitzschia graciliformis Lange-Bert. & Simonsen
Nitzschia gracilis Hantzsch
Nitzschia graciloides Hust. (see note 30)
Nitzschia hantzschiana Rabenh.
Nitzschia hantzschschiana [orthographic error]
Nitzschia heufleriana Grunow
Nitzschia heufleuriana Grunow [orthographic error]
Nitzschia hollerupensis Foged
Nitzschia holsatica Hust.
Nitzschia homburgiensis Lange-Bert.
Nitzschia hungarica Grunow
Nitzschia ignorata Krasske
Nitzschia impressa Hust.
Nitzschia inconspicua Grunow
Nitzschia incurvata var. lorenziana Ross
Nitzschia innominata Sovereign
Nitzschia insecta Hust.
Nitzschia intermedia Hantzsch
Nitzschia interrupta (Reich.) Hust.
Nitzschia kuetzingiana Hilse
Nitzschia kuetzingiana var. exilis Grunow
Nitzschia kuetzingioides Hust.
Nitzschia kutzingiana Hilse [orthographic error]
Nitzschia lacunarum Hust.
Nitzschia lacuum Lange-Bert.
Nitzschia lanceolatae [orthographic error]
Nitzschia lauenburgiana Hust.
Nitzschia laurenburgiana Hust. [orthographic error]
Nitzschia levidensis (W.Sm.) Grunow
Nitzschia linearis (C. Agardh) W.Sm.
Nitzschia linearis var. tenuis (Kütz.) Grunow
Nitzschia liskipata [orthographic error]
Nitzschia longissima (Bréb.) Ralfs
Nitzschia longissima var. closterium (W.Sm.) VanHeurck
Nitzschia longissima var. reversa Grunow
Nitzschia longissima fo. parva Grunow (see note 31)
Nitzschia lorenziana Grunow
Nitzschia luzonensis Hust.
Nitzschia macilenta Greg.
Nitzschia mediocris Hust.
Nitzschia microcephala Grunow
Nitzschia minutula Grunow
Nitzschia obsidialis Hust.
Nitzschia obtusa W.Sm.
Nitzschia obtusa var. scalpelliformis Grunow
Nitzschia ovalis Arn.
Nitzschia palea (Kütz.) W.Sm.
Nitzschia palea var. debilis (Kütz.) Grunow
Nitzschia palea var. sumatrana Hust.
Nitzschia palea var. tenuirostris Grunow (see note 31)
Nitzschia paleacea Grunow
Nitzschia paleoides Hust.
Nitzschia paradoxa (Gmelin) Grunow
Nitzschia paradoza [orthographic error]
Nitzschia parvula W.Sm.
Nitzschia parvula var. terricola Lund
Nitzschia perminuta (Grunow) M. Perag.
Nitzschia philippinarum Hust.
Nitzschia planctonica Hust.
Nitzschia pseudoamphioxys Hust.
Nitzschia pseudoatomus Stoermer [nom. nud.]
Nitzschia pseudofonticola Hust.
Nitzschia pumila Hust. [cf. Lange-Bert.]
Nitzschia pura Hust.
Nitzschia pusilla Grunow
Nitzschia pusilla (Kütz.) Grunow emend. Lange-Bert.
Nitzschia radicula Hust.
Nitzschia recta Hantzsch
Nitzschia romana Grunow
Nitzschia rostellata Hust.
Nitzschia scalaris (Ehrenb.) W.Sm.
Nitzschia sicula var. migrans (Cleve) Hasle
Nitzschia sigma (Kütz.) W.Sm.
Nitzschia sigma var. diminuta Grunow
Nitzschia sigma var. rigida (Kütz.) Grunow
Nitzschia sigma var. sigmatella (Greg.) Grunow
Nitzschia sigmoidea (Nitzsch.) W.Sm.
Nitzschia sinuata W.Sm.
Nitzschia sinuata var. delognei (Grunow) Lange-Bert.
Nitzschia sinuata var. tabellaria (Grunow) Grunow
Nitzschia sociabilis Hust.
Nitzschia sphaerophora A.Cleve
Nitzschia spiculoides Hust.
Nitzschia spiculum Hust.
Nitzschia stagnorum Rabenh.
Nitzschia stricta Hust.
Nitzschia subacicularis Hust.
Nitzschia subamphioxoides Hust.
Nitzschia subcapitellata Hust.
Nitzschia sublinearis Hust.
Nitzschia subrostrata Hust.
Nitzschia subrostroides Choln.
Nitzschia subtilis (Kütz.) Grunow
Nitzschia subtilis var. paleacea Grunow
Nitzschia tabellaria Grunow
Nitzschia tarda Hust.
Nitzschia tenuis W.Sm.
Nitzschia thermalis (Ehrenb.) Auersw.
Nitzschia thermalis var. intermedia Grunow
Nitzschia thermalis var. minor Hilse
Nitzschia tropica Hust.
Nitzschia tryblionella Hantzsch in Rabenh.
Nitzschia tryblionella var. debilis (Arn.) A. Mayer
Nitzschia tryblionella var. levidensis (W.Sm.) Grunow
Nitzschia tryblionella var. victoriae Grunow
Nitzschia valdestriata Aleem & Hust.
Nitzschia vulga Choln.
Nitzschia vermicularis (Kütz.) Hantzsch
Nitzschia vexans Grunow
Nitzschia vitrea Norman
Nitzschia woltereckii Hust.


Odontidium hymale [orthograhic error]
Odontidium mutabile W.Sm.


Oestrupia bicontracta (Østrup) Lange-Bert. & Krammer
Oestrupia zachariasi (Reich.) Hust.
Oestrupia zachariasi var. undulata (Schultz) Stoermer & Yang


Opephora ansata Hohn & Hellerm.
Opephora martyi Hérib.
Opephora pinnata Ehrenb.


Orthosira dickiei Thwaites


Pinnularia abaujensis(Pant.) Ross
Pinnularia abaujensis var. linearis (Hust.) R.M.Patrick
Pinnularia abaugensis var. rostrata (R.M.Patrick) R.M.Patrick [orthographic error]
Pinnularia abaujensis var. rostrata (R.M.Patrick) R.M.Patrick
Pinnularia abaujensis var. subundulata (A.Mayer) R.M.Patrick
Pinnularia acrosphaeria W.Sm.
Pinnularia amphioxys Ehrenb.
Pinnularia appendiculata (C.Agardh) Cleve
Pinnularia biceps Greg.
Pinnularia biceps fo. petersenii Ross
Pinnularia borealis Ehrenb.
Pinnularia borealis var. rectangularis Carlson
Pinnularia brandelii Cleve
Pinnularia braunii (Grunow) Cleve
Pinnularia braunii var. amphicephala (A.Mayer) Hust.
Pinnularia braunii var. amphipalor [nom. nud.]
Pinnularia brebissonii (Kütz.) Rabenh.
Pinnularia brebissonii var. diminuta (Grunow) Cleve
Pinnularia brevicostata Cleve
Pinnularia burkii R.M.Patrick
Pinnularia cardinaliculus Cleve
Pinnularia cardinalis (Ehrenb.) W.Sm.
Pinnularia cocconeis Ehrenb.
Pinnularia dactylus Ehrenb.
Pinnularia distinguenda Cleve
Pinnularia divergens W.Sm.
Pinnularia divergens var. bacillaris (M. Perag.) Mills
Pinnularia divergens var. elliptica (Grunow) Cleve
Pinnularia fasciata Lagerst.
Pinnularia gentilis (Donk.) Cleve
Pinnularia gibba Ehrenb.
Pinnularia gibba var. linearis Hust.
Pinnularia gibba var. parva (Ehrenb.) Grunow
Pinnularia gibba fo. subundulata A. Mayer
Pinnularia globiceps Greg.
Pinnularia globiceps var. krockii (Grunow) Cleve
Pinnularia hemiptera (Kütz.) Rabenh.
Pinnularia intermedia (Lagerst.) Cleve
Pinnularia interrupta W.Sm.
Pinnularia interrupta var. crassior (Grunow) Cleve (see note 32)
Pinnularia kriegeriana Krasske emend. Foged
Pinnularia krockii (Grunow) Cleve
Pinnularia latevittata var. domingensis Cleve
Pinnularia legumen (Ehrenb.) Ehrenb.
Pinnularia leptosoma (Grunow) Cleve
Pinnularia leptosoma fo. erlangensis A. Mayer
Pinnularia lundii Hust.
Pinnularia major(maior) (Kütz.) Rabenh.
Pinnularia mesolepta (Ehrenb.) W.Sm.
Pinnularia microstauron (Ehrenb.) Cleve
Pinnularia microstauron var. biundulata O.Müll.
Pinnularia molaris (Grunow) Cleve
Pinnularia nobilis (Ehrenb.) Ehrenb.
Pinnularia nodosa (Ehrenb.) W.Sm.
Pinnularia obscura Krasske
Pinnularia radiosa W.Sm.
Pinnularia rupestris Hantzsch
Pinnularia ruttneri Hust.
Pinnularia semicruciata A.Cleve
Pinnularia socialis (T.C. Palm.) Hust.
Pinnularia stomatophora (Grunow) Cleve
Pinnularia subcapitata Greg.
Pinnularia subcapitata var. paucistriata (Grunow) Cleve
Pinnularia subrostrata (A.Cleve) A.Cleve
Pinnularia substomatophora Hust.
Pinnularia sudetica Hilse
Pinnularia tabellaria Ehrenb.
Pinnularia tenuis Greg.
Pinnularia tenuis var. interrupta (Font.) A.Cleve
Pinnularia termes Ehrenb.
Pinnularia termitina (Ehrenb.) R.M.Patrick
Pinnularia tibetana Hust.
Pinnularia torta (A. Mann) R.M.Patrick
Pinnularia trigonocephala Cleve
Pinnularia undulata Greg.
Pinnularia undulata var. subundulata Grunow
Pinnularia viridis (Nitzsch.) Ehrenb.
Pinnularia viridis var. commutata (Grunow) Cleve


Placoneis clementioides (Hust.) E.J.Cox
Placoneis clementis (Grunow) E.J.Cox
Placoneis dicephala (W.Sm.) Meresch.
Placoneis elginensis (Greg.) E.J.Cox
Placoneis exigua (Greg.) Meresch.
Placoneis gastrum (Ehrenb.) Meresch.
Placoneis placentula (Ehrenb.) Heinzerl.
Placoneis placentula fo. rostrata (A.Mayer) Bukht.
Placoneis pseudanglica (Lange-Bert.) E.J.Cox


Plagiotropis lepidoptera (Greg.) C.W.Reimer in Patrick & Reimer
Plagiotropis lepidoptera var. proboscidea (Cleve) C.W.Reimer in Patrick & Reimer


Planothidium delicatulum (Kütz.) Bukht. & Round
Planothidium dubium (Grunow) Bukht. & Round
Planothidium ellipticum (A.Cleve) Bukht. & Round
Planothidium hauckianum (Grunow) Bukht. & Round
Planothidium haukianum (Grunow) Bukht. & Round [orthographic error]
Planothidium lanceolatum (Bréb.) Bukht. & Round
Planothidium perigallii (Brun & Hérib. in Hérib.) Bukht. & Round


Pleurosigma acuminatum (Kütz.) Grunow
Pleurosigma attenuatum (Kütz.) W.Sm.>/a>
Pleurosigma delicatulum W.Sm.
Pleurosigma eximium (Thwaites) Cleve & Grunow
Pleurosigma kuetzingii Grunow(see note 18)
Pleurosigma obscurum W.Sm.
Pleurosigma sciotense Sull.
Pleurosigma spencerii Grunow
Pleurosigma spencerii var. minor Grunow [nom. nud.]
Pleurosigma wormleyi Sull.


Pleurosira laevis (Ehrenb.) Compère


Psammothidium altaicum
(Poretzky) Bukht.
Psammothidium abundans fo. rosenstockii (Lange-Bert. in Lange-Bert. & Krammer) Bukht.
Psammothidium bioreti (Germain) Bukht. & Round
Psammothidium didymum (Hust.) Bukht. & Round
Psammothidium laurenbergianum (Hust.) Bukht. & Round
Psammothidium levanderi (Hust.) Bukht. & Round (see note 4)
Psammothidium marginulatum (Grunow) Bukht. & Round
Psammothidium subatomoides (Hust.) Bukht. & Round
Psammothidium ventralis Bukht. & Round


Pseudostaurosira brevistriata (Grunow in VanHeurck) D.M.Williams & Round
Pseudostaruosira brevistriata var. inflata (Pant.) M.B.Edlund


Pseudoeunotia lunaris Ehrenb.


Reimeria sinuata (Greg.) Kociolek & Stoermer
Reimeria sinuata fo. antiqua (Greg.) Kociolek & Stoermer


Rhizosolenia eriense H.L.Sm.
Rhizosolenia eriensis H.L. Sm. in Briggs
Rhizosolenia eriensis var. pusilla Wolosz. in Schröd.
Rhizosolenia eriensis var. zachariasi (Brun) Playf.
Rhizosolenia gracilis H.L. Sm.
Rhizosolenia longiseta Zach.


Rhoicosphenia curvata (Kütz.) Grunow
Rhoicosphenia curvata var. subacuta M. Schmidt


Rhopalodia argus W.Sm.
Rhopalodia gibba (Ehrenb.) O.Müll.
Rhopalodia gibba var.ventricosa (Kütz.) Perag. & M.Perag.
Rhopalodia gibberula (Ehrenb.) O.Müll.
Rhopalodia patallel (Grunow) O.Müll. [orthographic error]
Rhopalodia parallela (Grunow) O.Müll.


Rossithidum pusillum (Grunow) Bukht. & Round


Rouxia californica var. minuta A.Cleve


Schizonema viridulum Bréb.
Schizonema vulgare Thwaites


Scoliopleura campylogramma (Ehrenb.) Rabenh.


Sellaphora americana (Ehrenb.) D.G.Mann
Sellaphora bacillum (Ehrenb.) D.G.Mann
Sellaphora laevissima (Kütz.) D.G.Mann
Sellaphora mutata (Krasske) Lange-Bert.
Sellaphora nyassensis (O.Müll.) D.G.Mann
Sellaphora seminulum (Grunow) D.G.Mann
Sellaphora parapupula Lange-Bert.
Sellaphora pupula (Kütz.) Mereschk.
Sellaphora pupula fo. capitata (Skvortsov & K.I.Mey.) Poulin in Poulin, Hamilton & Proulx
Sellaphora pupula var. elliptica (Hust.) Poulin in Poulin, Hamilton & Proulx
Sellaphora pupula var. mutata (Krasske) Poulin in Poulin, Hamilton & Proulx
Sellaphora pupula fo. rostrata (Hust.) Bukht.
Sellaphora pupula var. rectangularis (Greg.) Mereschk.
Sellaphora rectangularis (Greg.) Lange-Bert. & Metzeltin in Lange-Bert.
Sellaphora vitabunda (Hust.) D.G.Mann


Skeletonema costatum (Grev.) Cleve
Skeletonema potamos (Weber) Hasle in Hasle & Evensen
Skeletonema potainus (Weber) Halse [orthographic error]
Skeletonema subsalsum (A.Cleve) Bethge
Skeletonema subsalsa (A. Cleve) Bethge [orthographic error]


Sphinctocystis elliptica (Kütz.) Kuntze
Sphinctocystis librilis (Ehrenb.) Hass.


Stauroneis acuta W.Sm.
Stauroneis acutiuscula M. Perag. & Hérib. in Hérib.
Stauroneis agrestis J.B.Peters.
Stauroneis alabamae Heid.
Stauroneis amphioxys Greg.
Stauroneis anceps Ehrenb.
Stauroneis anceps var. americana C.W.Reimer
Stauroneis anceps var. hyalina Brun & M. Perag.
Staruoneis anceps var. hylania Brun & M.Perag. [orthographic error]
Stauroneis anceps var. siberica Grunow
Stauroneis anceps fo. gracilis Rabenh.
Stauroneis anceps fo. linearis (Ehrenb.) Hust.
Stauroneis borrichii fo. subcapitata (J.B.Petersen) Lund
Stauroneis dilatata Ehrenb.
Stauroneis dilitata Ehrenb. [orthographic error]
Stauroneis dilatata fo. baicalensis Skvortsov & K.I.Mey.
Stauroneis dilata var. baicalensis Skvortsov & K.I.Mey. [orthographic error]
Stauroneis fluminea R.M.Patrick & Freese
Stauroneis gracilis Ehrenb.
Stauroneis gregorii Ralfs
Stauroneis kriegeri R.M.Patrick
Stauroneis kriegeri fo. undulata Hust.
Stauroneis lauenburgiana Hust.
Stauroneis linearis Ehrenb.
Stauroneis livingstonii C.W.Reimer
Stauroneis neohyalina Lange-Bert. & Krammer in Lange-Bert.
Stauroneis nobilis var. baconiana (Stodd.) C.W.Reimer
Stauroneis obtusa Lagerst.
Stauroneis phoenicenteron (Nitzsch.) Ehrenb.
Stauroneis phoenicenteron var. brevis Dippel
Stauroneis phoenicenteron fo. gracilis (Ehrenb.) Hust.
Stauroneis phoenicenteron var. intermedia (Dippel) A.Cleve
Stauroneis phoenicenteron fo. lanceolata (Kütz.) Brun
Stauroneis phylloides Ehrenb.
Stauroneis producta Grunow
Stauroneis semen Ehrenb.
Stauroneis siberica (Grunow) Lange-Bert. & Krammer in Lange-Bert.
Stauroneis smithii Grunow
Stauroneis smithii var. borgei Ehrenb.
Stauroneis smithii var. incisa Pant.
Stauroneis smithii var. minima Haworth
Stauroneis smithii var. minuta Haworth [orthographic error]
Stauroneis stodderi Greenleaf


Staurophora amphioxys (Greg.) D.G.Mann in Round, Crawford & Mann


Staurosira brevistriata Grunow (see note 33)
Fragilaria brevistriata Grunow
Staurosira capucina Borzsc. (see note 33)
Fragilaria capucina Desm.
Staurosira entomon Ehrenb. (see note 33)
Fragilaria entomon (Ehrenb) Ehrenb.
Staurosira mutabilis (W.Sm.) Grunow (see note 33)
Fragilaria pinnata Ehrenb.


Staurosira construens Ehrenb.
Staurosira construens fo. subsalina (Hust.) Bukht.
Staurosira construens var. binodis (Ehrenb.) Hamilton in Hamilton, Poulin, Prévost, Angell & Edlund
Staurosira construens var. capitata (Hérib.) Bukht.
Staurosira construens var. venter (Ehrenb.) Hamilton


Staurosirella lapponica (Grunow in VanHeurck) D.M.Williams & Round
Staurosirella leptostauron (Ehrenb.) D.M.Williams & Round
Staurosirella leptostauron var. dubia (Grunow) M.B.Edlund
Staurosirella leptostauron var. rhomboides (Grunow) Bukht.
Staurosirella pinnata (Ehrenb.) D.M.Williams & Round
Staurosirella pinnata var. intercedens (Grunow in VanHeurck) Hamilton in Hamilton, Poulin, Prévost, Angell & Edlund
Staurosirella pinnata var. lancettula (Schum.) Poulin in Poulin, Hamilton & Proulx


Stenopterobia anceps (Lewis) Bréb.
Stenopterobia cruvula (W.Sm.) Krammer
Stenopterobia delicatissima (Lewis) Bréb. ex VanHeurck
Stenopterobia intermedia (Lewis) VanHeurck


Stephanodiscus alpinusHust.
Stephanodiscus astraea(Ehrenb.) Grunow
Stephanodiscus astraea var. intermedia Fricke
Stephanodiscus astraea var. minutula (Kütz.) Grunow in VanHeurck
Stephanodiscus astraea var. minutulus (Kütz.) Grunow
Stephanodiscus binderanus ( Kütz.) WilliKreig.
Stephanodiscus binderanus var. oestrupii (A.Cleve) A.Cleve
Stephanodiscus carconensisGrunow
Stephanodiscus carconensis var. pusilla Grunow
Stephanodiscus conspiceuporus Stoermer, Håk. & Theriot [orthographic error]
Stephanodiscus conspicueporus Stoermer, Håk. & Theriot
Stephanodiscus dubius (Fricke) Hust.
Stephanodiscus hantzchii Grunow [orthographic error]
Stephanodiscus hantzschii Grunow
Stephanodiscus hantzschii Grunow fo. hantzschii
Stephanodiscus hantzschii var. pusilla Grunow
Stephanodiscus hantzschii fo. tenuis (Hust.) Håk. & Stoermer
Stephanodiscus hantzschii vel. tenius [nom. illegit.]
Stephanodiscus invisitatus Hohn & Hellerm.
Stephanodiscus kutzingiana [nom. nud.]
Stephanodiscus lucens Hust.
Stephanodiscus medius Håk.
Stephanodiscus minutula (Kütz.) Round
Stephanodiscus minutulus (Kütz.) Cleve & Möll.
Stephanodiscus minutus Grunow
Stephanodiscus niagara Ehrenb. [orthographic error]
Stephanodiscus niagarae Ehrenb.
Stephanodiscus niagarae var. magnifica Fricke
Stephanodiscus parvus Stoermer & Håk.
Stephanodiscus paruvs Stoermer & Håk. [orthographic error]
Stephanodiscus rotula (Kütz.) Hendey
Stephanodiscus rotula var. minutula (Kütz.) Grunow
Stephanodiscus subsalsus ( A.Cleve) Hust.
Stephanodiscus subtilis (Van Goor) A.Cleve
Stephanodiscus subtransilvanicus Gasse
Stephanodiscus superiorensis Stoermer & Theriot
Stephanodiscus tenuis Hust.
Stephanodiscus transylvanicus Pant.
Stephanodisus transsylvanicus Pant. [orthographic error]
Stephanodiscus vestibulis Håk., Stoermer & Theriot


Striatella fenestrata (Lyngb.) Kuntze
Striatella flocculosa (Roth) Kuntze


Stsauroneis anceps Ehrenb. [orthographic error]


Surirella amphioxys W.Sm.
Surirella anceps Lewis
Surirella angusta Kütz.
Surirella angusta var. panduriformis W.Sm. nomum nudum
Surirella angustata Kütz. [orthographic error]
Surirella apiculata W.Sm.
Surirella bifrons Ehrenb.
Surirella birostrata Hust.
Surirella biseriata Bréb. & Godey
Surirella biseriata var. bifrons (Ehrenb.) Hust.
Surirella biseriata var. bifrons fo. amphioxys (W.Sm.) Hust.
Surirella biseriata var. bifrons fo. punctata Meister
Surirella biseriata var. constricta Grunow
Surirella biseriata var. diminutaA.Cleve
Surirella biseriata var. orientalis Skvortzov
Surirella brebissonii Krammer & Lange-Bert.
Surirella cardinalisKitton
Surirella delicatissima Lewis
Surirella didyma Kütz.
Surirella elegans Ehrenb.
Surirella gracilis (W.Sm.) Grunow
Surirella guatemalensis Ehrenb.
Surirella iowensis R. L. Lowe
Surirella lagerheimii Cleve
Surirella librile Ehrenb.
Surirella linearis W.Sm.
Surirella linearis var. constricta Grunow
Surirella linearis var. helvetica (Brun) F.Meister
Surirella minuta Bréb. in Kütz.
Surirella molleriana Grunow
Surirella norvegica Eulenst.
Surirella oregonica Ehrenb.
Surirella ovalis Bréb.
Surirella ovalis var. minuta VanHeurck
Surirella ovalis var. pinnata W.Sm. [orthographic error]
Surirella ovata Kütz.
Surirella ovata var. africana Choln.
Surirella ovata var. crumena (W.Sm.) Hust.
Surirella ovata var. pinnata (W.Sm.) Rabenh.
Surirella ovata var. salina (W.Sm.) Rabenh.
Surirella panduriformis W.Sm.
Surirella peisonis Pant.
Surirella pinnata var. pandurifoemis (W.Sm.) Hust.
Surirella regina Janisch
Surirella robusta Ehrenb.
Surirella robusta var. armata Hust.
Surirella robusta var. splendida (Ehrenb.) VanHeurck
Surirella robustior MacKay
Surirella saxonica Auersw.
Surirella sigmoidea Ehrenb.
Surirella spiralis Kütz.
Surirella splendida Ehrenb.
Surirella striata Leud-Fortm.
Surirella striatula Turp.
Surirella suecica Grunow
Surirella suevica Zeller
Surirella tenera Greg.
Surirella tenera var. nervosa A. W. F. Schmidt
Surirella tennuis [Orthographic error]
Surirella tenuis Mayer
Surirella tenuissima Hust.
Surirella turgida W.Sm.
Surirella undulata Ehrenb.


Synedra actinastroides Lemm.
Synedra acus Kütz.
Synedra acus var. angustissima Grunow in VanHeurck
Synedra acus var. radians (Kütz.) Hust.
Synedra affinis Kütz.
Synedra amphicephala Kütz.
Synedra amphicephala var. asiatica Skvortzov
Synedra amphicephala var. austraica (Grunow) Hust.
Synedra amphicephala var. intermedia A. Cleve
Synedra capitata Ehrenb.
Synedra capitata var. fossilis [nom. nud.]
Synedra capucina [nom. illegit.]
Synedra chaseii Thomas
Synedra crotonensis Grunow
Synedra crotonensis var. prolongata Grunow
Synedra cyclopum Brutschy
Synedra danica Kütz.
Synedra delicatissima W.Sm.
Synedra delicatissima var. angustissima Grunow
Synedra demerarae Grunow
Synedra elongatum [nom. nud.]
Synedra famelica Kütz.
Synedra fameilica Kütz. [orthographic error]
Synedra familica Kütz. [orthographic error]
Synedra fasciculata (C. Agardh) Kütz.
Synedra fasciculata var. truncata (Grev.) R.M.Patrick
Synedra filiformis Grunow
Synedra filiformis var. exilis A.Cleve
Synedra gaillonii (Bory) Ehrenb.
Synedra goulardi Bréb.
Synedra goulardi var. fluviatilis (Lemm.) Freng.
Synedra hyperborea Grunow
Synedra hyperborea var. rostellata Grunow
Synedra incisa Boyer
Synedra laevigata Grunow
Synedra lanceolata Kütz.
Synedra longiceps Ehrenb.
Synedra longissima W.Sm.
Synedra lunaris Ehrenb.
Synedra mazamaensis Sovereign
Synedra menisculus [orthographic error]
Synedra minuscula Grunow in VanHeurck
Synedra montana Krasske
Synedra nana F.Meister
Synedra netronoides Hohn & Hellerm.
Synedra ostenfeldii (Kreig.) A.Cleve
Synedra oxyrhynchus Kütz.
Synedra parasitica (W.Sm.) Hust.
Synedra parasitica var. subconstricta (Grunow) Hust.
Synedra pulchella Ralfs
Synedra pulchella var. lacerata Hust.
Synedra pulchella var. lanceolata O'Meara
Synedra radians Kütz.
Synedra rumpens Kütz.
Synedra rumpens var. familiaris (Kütz.) Hust.
Synedra rumpens var. fragilarioides Grunow
Synedra rumpens var. meneghiniana Grunow
Synedra rumpens var. scotia Grunow
Synedra rumpens var. ? H.H. Chase [nom. illegit.]
Synedra simalongis W.Sm.
Synedra spathulifera Grunow
Synedra splendens Kütz.
Synedra stela Hohn & Hellerm.
Synedra tabulata (C. Agardh) Kütz.
Synedra tenera W.Sm.
Synedra tenuissima Kütz.
Synedra ulna (Nitzsch.) Ehrenb.
Synedra ulna var. aequalis (Kütz.) Hust.
Synedra ulna var. amphirhynchus (Ehrenb.) Grunow
Synedra ulna var. biceps (Kütz.) Kirchn.
Synedra ulna var. chaseana Thomas
Synedra ulna var. chaseii Thomas
Synedra ulna var. claviceps Hust.
Synedra ulna var. constricta Venkt.
Synedra ulna var. contracta Østrup
Synedra ulna var. danica (Kütz.) VanHeurck
Synedra ulna var. impressa Hust.
Synedra ulna var. longissima (W.Sm.) Brun
Synedra ulna var. obtusa (W.Sm.) Grunow
Synedra ulna var. oxyrhynchus (Kütz.) VanHeurck
Synedra ulna var. oxyrhynchus fo. mediocontracta (Forti) Hust.
Synedra ulna var. spathulifera (Grunow) VanHeurck
Synedra ulna var. splendens (Kütz.) VanHeurck
Synedra ulna var. subaequalis (Grunow) VanHeurck
Synedra utermohlii Hust.
Synedra vaucheriae (Kütz.) Kütz.
Synedra vaucheriae var. capitellata (Grunow) Cleve
Synedra vaucheriae var. truncata (Grev.) Grunow
Synedra vitrea Kütz.


Tabularia fasciculata (C. Agardh) D.M.Williams & Round


Tabellaria fenestrata (Lyngb.) Kütz.
Tabellaria fenestrata var. asterionelloides Grunow
Tabellaria fenestrata var. geniculata A.Cleve
Tabellaria fenestrata var. intermedia Grunow
Tabellaria flocculosa (Roth) Kütz.
Tabellaria flocculosa var. linearis Koppen
Tabellaria genestrata [orthographic error]
Tabellaria quadriseptata Knuds.
Tabellaria trinodis Ehrenb.


Terpsinoe musica Ehrenb.


Tetracyclus rupestris (Braun) Grunow


Thalassiosira bramaputrae (Ehrenb.) Håk. & Locker
Thalassiosira fluviatilis Hust.
Thalassiosira incerta Marakova
Thalassiosira guillardii Hasle
Thalassiosira lacustris (Grunow) Hasle
Thalassiosira levanderi Van Goor
Thalassiosira pseudonana Hasle & Heim.
Thalassiosira simplex Hust.
Thalassiosira visurgis Hust.
Thalassiosira weissflogii (Grunow) Fryxell & Hasle


Tropidoneis lepidoptera (Greg.) Cleve
Tropidoneis lepidoptera var. proboscidea Cleve


Treyblionella scutellum (Bail.) W.Sm. [orthographic error]


Tryblionella acuta (Cleve) D.G.Mann in Round, Crawford & Mann
Tryblionella angustata W.Sm.
Tryblionella angustata var. acuta (Grunow) Bukht.
Tryblionella apiculata Greg.
Tryblionella debilis (Arn.) Grunow in Cleve & Grunow
Tryblionella gracilis W.Sm.
Tryblionella hungarica (Grunow) D.G.Mann
Tryblionella levidensis W.Sm.
Tryblionella scutellum (Bailey) W.Sm.
Tryblionella victoriae Grunow


Urosolenia eriensis (H. L. Sm.) Round & R.M.Crawford in Round, Crawford & Mann
Urosolenia longiseta (Zach.) M.B.Edlund & Stoermer








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TAXONOMIC NOTES AND CONSIDERTATIONS

1. The concept of Achnanthes biasolettiana (Kütz.) Grunow carried at the Center for Great Lakes and Aquatic Sciences (formerly the Great Lakes Research Division) was based on Van Heurck 1880-1881. The entities assigned to Achnanthes biasolettiana would be best associated with Lange-Beralot and Krammer's Achnanthes rosenstockii Lange-Bert. in Lange-Bertalot and Krammer 1989. Bukhtiyatova and Round (1996) based Psammodictyon abundans fo. rosenstockii on Lange-Bertalot and Krammers's Achnanthes rosenstockii. The nomenclatural changes are noted for the morphological entity named Achnanthes biasolettiana in publications originating from the Center for Great Lakes and Aquatic Sciences.

2. Lange-Bertalot (1993) has synonymized Achnanthes gracillima (Meister) Mills non Hustedt 1927. Our speciem is identified in reference to the Hustedt concept emended by Foged. Hence the synonymy proposed by Lange-Bertalot is not included here.

3. Simonsen (1987) discusses the basis for transferring Eucconeis lapponica Hust. to Achnanthes quadrataera (Østrup) Möller ex Foged. Lange-Bertalot in Lange-Bertalot and Krammer (1989) suggests Achnanthes lapponica (Eucocconeis lapponica) be transferred to Achnanthes laevis var. quadratarea (Østrup) Lange-Bert. in Lange-Bert. & Krammer. Lange-Bertalot also suggested Achnanthes lapponica var. ninckei be transferred to Achnanthes laevis var. ninckei (H. Guermer & Mang.) Lange-Bert. in Lange-Bert. & Krammer. Round, Crawford and Mann (1990) suggested Eucocconeis be considered a valid genus closely related to both Achnanthidium and Cocconeis. We retain the Eucocconeis designation pending further investigation into this little studied, complex group.

4. The citation Psammothidium levanderi (Hust.) Czarn. in Czarn. & Edlund is an error in Bukhtiyarova and Round 1996. Psammodictyon was erected in 1996 and Czarnecki and Edlund effected the change to Achnanthidium in 1995.

5. Lange-Bertalot in Lange-Bertalot & Krammer (1989) place Achnanthes sublaevis Hust. in synonymy with Achnanthes ventralis (Krasske) Lange-Bert. in Lange-Bert. & Krammer.

6. Amphora hemicycla Stoermer and Yang 1971
The original publication of this name has in the protologue Amphora hemycyla with the plate legend having Amphora hemicycla. Stoermer (1980)used Amphora hemicycla suggesting this is the intended name. Support for this argument is the plate legend and the habitat description of the taxon being primarily benthic in the protologue. It is suggested the original publication contains an orthographic error and the proper spelling of the specific epithet should be hemicycla not hemicyla. (Another interpretation for this may be hemicyla is not a proper word and subsequently needs to be corrected).

7. Krammer and Lange-Bertalot (1985) propose Amphora submontana Hust. as asynonym of Amphora montana and cite their synonymy decision in 1986. Simonsen (1987) claims the wrong slide (i.e. specimen) was used for the decision. Lange-Bertalot and Krammer (1987) acknowledge the correct Hustedt type and maintain their synonymy. The resolution of this problem requires careful examination of the Hustedt and Krasske types along with other collections to determine the variablity existing within the taxa to determine whether there are two distinct taxa or one taxon with a degree of variability.

8. This transfer has not been made by the authors indicated, neither is the transfer legitimate as Anomoeoneis sphaerophora is the type of Anomoeoneis.

9. In the Krammer and Lange-Bertalot Bacillariophyceae (1986, 1988, 1991a, 1991b) the minor genera in the Fragilariaceae (i.e. Hannaea) are combined into Fragilaria. We prefer to keep the classical smaller genera along with the modern approach.

11. The original list (Stoermer and Kreis 1978)had Fragilaria minuscula Grunow. Williams and Round (1987) created a new combination Fragilaria miniscula (Grunow in Van Heurck) with the basionym Synedra miniscula Grunowin Van Heurck. We have been unable to determine if our record is conspecific with the synonymy of Williams and Round.

12. Krammer & Lange-Bertalot consider Fragilaria vaucheriae and its varities to be Fragilaria capucina.

13. Lange-Bertalot & Reichardt in Lange Bertalot 1993 consider Gomphonema acuminatum var. turris (Ehrenb.) Cl. sensu Fricke to be Gomphonema contraturris Lange-Bert. & Reichardt. The application of this synonymy to the Great Lakes specimens needs further investigation.

14. Reichardt and Lange-Bertalot (1991) consider Gomphonema intricatum to be Gomphonema dichotomumKütz. This is also suggested in Krammer and Lange-Bertalot (1991a, p. 416).

15. Reichardt and Lange-Bertalot (1991) consider Gomphonema intricatum var. pumila to be Gomphonema pumilum (Grunow) Krammer & Lange-Bert. This is also suggested in Krammer & Lange-Bertalot (1991a, p. 416).

16. Reichardt & Lange-Bertalot (1991) consider Gomphonema intricatum var. vibrio to be Gomphonema vibrioides Krammer & Lange-Bert.

17. In Patrick & Reimer (1975) Gomphonema subclavatum var. mexicanum (Grunow) R.M.Patrick is included and the name is credited as having been publilshed in Hohn (1961). In Hohn (1961) the name appears only in a list. There is no written description or any indication that it is a new variety. The name is invalidly published according to the International Code of Botanical Nomenclature (Greuter et al. 1994).

18. The synonymy reported in the original list which had Gyrosigma kuetzingii as a synonym of Gyrosigma spencerii (Stoermer and Kreis 1978) is incorrect according to Sterrenberg (1995). The synonymy is incompatable with the taxon bearing the superfluous and illegitimate name G. spencerii (Sterrenburg 1995).

19. Lange-Bertalot (1993) has proposed Hantzschia amphioxys (Ehrenb.) Grunow pro parte to be Hantzschia abundans. In order to apply this synonymy re-examination of the Great Lakes records needs to be conducted.

20. Melosira crenulata (Ehrenb.) Kütz. and Melosira crenulata var. tenuis Kütz. present problems of interpretation. These are old names which by contemporary standards were dumping grounds for Melosira specimens. Records at the Academy of Natural Science of Phildelphia Diatom Herbarium demonstrate the problem. Each of the Academy's records have samples associated with them so that verification can be made. Among the many records for Melosira crenulata there are seven different Melosira taxa listed in synonomy for various collections. Until we are able to examine the Great Lakes collections on which the M. crenulata records were based it would be most prudent to leave the names as they stand without attempts to suggest synonyms.

21. This combination comes from Krammer and Lange-Bertalot (1991a, p. 14) but R. M. Crawford has not made the transfer (personal communication, Crawford).

22. Lange-Bertalot (1993) places Navicula cari Ehrenb. sensu Hustedt into his manuscript name Navicula cariocincta Lange-Bertalot. This synonymy is an attempt to clarify a taxonomic problem in this group of Navicula; however, it only adds to the confusion. The name Navicula cariocincta does not meet the criteria for valid publication (Greuter et al. 1994).

23. In order to apply the synonymy proposed by Krammer & Lange-Bertalot (1986) for Navicula hustedtii fo. obtusa a thorough examination of the taxa Navicula latersotrata Hust., Navicula hustedtii fo. obtusa Hust., Navicula hustedtii fo. japonica Hust., and Navicula absoluta Hust. needs to be conducted.

24. Krammer & Lange-Bertalot (1986) have synonymized the Navicula kotschyi Grunow sensu Hust. non Grunow (Hustedt 1930) with Navicula pseudokotschyi Lange-Bert. There is sufficient difference between Navicula kotschyi Grunow sensu Hust. non Grunow and Navicula kotschyi Grunow to warrant caution in placing the synonymy in the list. We have not been able to verify the record of N. kotschyi Grunow with a reference specimen to ascertain which concept was employed at the time of identification.

25. Lange-Bertalot (1980) demonstrated Navicula lanceolata sensu Agardh, Navicula lanceolata Agardh sensu Kütz. Navicula lanceolata Agardh sensu Ehrenb. and Navicula lanceolata Agardh sensu Hust. to be three different species.

Navicula lanceolata (C.Agardh) Ehrenb. = Navicula lanceolata(C.Agardh) Ehrenb.
Navicula lanceolata (C.Agardh) Kütz. = Navicula trivialis Lange-Bert.
Navicula lanceolata (C.Agardh) Kutz. sensu Hust. = Navicula pseudolanceolata Lange-Bert.

We could assume the majority of Navicula lanceolata records were identified with either Hustedt (1930) or Patrick and Reimer (1966) which presents problems. Both authors cite (C.Agardh) Kütz. as the authority for the taxon. Patrick states having examined the Agardh type and established a lectotype (Agardh Herb. Lund No. 3401 "Frustulia lanceolata" Ge.B.A. +4) then gives Kützing as the authority. Adopting the synonymy of Lange-Bertalot (1980)would result in the following:
If Hustedt 1930 was used to identify a specimen the synonymy is:

Navicula lanceolata (C.Agardh) Kütz. = Navicula pseudolanceolata Lange-Bert.

If Patrick and Reimer (1966) was used to identify a specimen the synonymy is:

Navicula lanceolata (C.Agardh) Kütz. = Navicula trivialis Lange-Bert.

This is unsettling as Patrick in Patrick and Reimer (1966) clearly indicates Pl. 48, fig. 20 as a drawing of the Lectotype. This would mean identifications made using Patrick and Reimer (1966) and citing Pl. 48, fig. 20 represent the Agardh type and should not be considered Navicula trivialis Lange-Bert. which would be the case if one were to just do "paper taxonomy".

26. It is unlikely the record of Navicula longirostris is correct as the questionable transfer of N. longirostris to Proschkinia would suggest a marine diatom in the Great Lakes.

27. Van Landingham 1975 suggested Navicula stauroptera var. parva (Ehrenb.) Grunow to be a synonym of Pinnularia parva (Ehrenb.) Greg. This suggestion is not tenable based on original illustrations of the taxa. Navicula stauroptera var. parva (Ehrenb.) Grunow is weakly capitate with a stauroid central area reaching the margin of the valve and striae which are radiate at the center and convergent at the poles while Pinnularia parva (Ehrenb.) Greg. has rounded ends, a small central area which does not extend to the margin and striae radiate throughout the valve. Based on the valve outline, strial pattern and central area the two taxa do not appear to be similar. Navicula stauroptera var. parva (Ehrenb.) Grunow appears to be a Pinnularia but does not appear to be Pinnularia parva as VanLandingham suggests. Resolution of this problem requires examination of the type specimens.

28. The synonomy suggested by Van Landingham 1975 is untenable. O'Meara's illustration of Navicula termes does not resemble Ehrenberg's 1841(1843) illustrations of Pinnularia termes. Although Ehrenberg's description is brief his illustration suggests a specimen with striae crossing the valve face while O'Meara's illustration has striae at the margin. The outlines are only superficially similar. Resolution of this problem requires investigation of the type specimens.

29. Our record of Navicula tumida Wm. Sm. appears to be a literature record as record of this taxon has not been located in the Center archives. It was listed in the first checklist (Stoermer and Kreis 1978). At that time the synonymy of Navicula anglica was presented. This should not be considered an orthographic error noting Navicula tumida Wm. Sm. is not to be confused with Navicula tumida Bréb. ex Kütz. Smith (1853) named a freshwater diatom from Bramley near Guildford, Navicula tumida. Navicula tumida Breb. ex Kutz. has been long associated with Scoliopleura and Mann in Round Crawford and Mann (1990) erected the genus Scolioneis with the type species Navicula tumida Breb ex Kutz. Hence the two should not be confused.

According to Krammer and Lange-Bertalot 1986 the systematics and nomenclature of the species complex comprising Navicula dicephala, Navicula elginensis, Navicula anglica and Navicula exigua is exceedingly complicated. Unfortunately their work has done little to uncomplicate the problem.

Krammer and Lange-Bertalot (1985) state on p. 90 that Navicula tumida is synonymous with Navicula anglica and Navicula elginensis. Then in 1986 Kammer and Lange-Bertalot state on p. 136 that Navicula tumida Wm. Sm. non Breb. ex Kutz. is synonymous with Navicula elginensis (Greg.) Ralfs in Pritchard and on p. 167 Navicula tumida Wm. Sm. sensu Grunow is synonymus with Navicula pusilla Wm. Sm. In both 1985 (p. 86) and 1986 (p. 137) Krammer and Lange-Bertalot state that Navicula anglica Ralfs sensu Hustedt 1930 is a new taxon, Navicula pseudanglica, and Navicula anglica Ralfs is synonymous with Navicula elginensis (Greg.) Ralfs (1985 p. 55 and 1986 p. 136).

This would lead us to the conclusion that our Navicula tumida Wm. Sm. and its suggested synonym Navicula anglica Ralfs should be Navicula pseudanglica Lange-Bertalot because most likely the species concept was based on the Hustedt (1930) presentation rather than that of Ralfs.

Cox (1987) resurrects Placoneis and suggests Navicula pseudanglica Lange-Bertalot for the basionym of Placoneis pseudanglica Cox. Cox (1987) admitting the systematics is confused bases her revision on Lange-Bertalot's interpretation of the nomenclatural history. So our Navicula tumida Wm. Sm. then should be named Placoneis pseudanglica Cox. However, if the identification of Navicula tumida was based on Wm. Smith Smith (1853) and not Hustedt's presentation then Navicula tumida should be Navicula elginensis according to Lange-Bertalot and Placoneis elginensis according to Cox.

It is considered best at this time to leave Navicula tumida Wm. Sm. without assigning a synonym until a specimen is located and examined in light of the recent approaches.

30. Depending on which Hustedt reference is used (Hustedt 1953, 1959) Lange-Bertalot in Krammer & Lange-Bertalot (1988) maintains different synonymies.
1953, Nitzschia graciloides = Nitzschia gracilis Hantz.
1959 Nitzschia graciloides = Nitzschia graciliformis Lange-Bert. & Simonsen

31. Bukhtiyarova (1995) proposed a number of nomenclatural changes, a few of which we disagree with. It is our considered opinion that Nitzschia longissima fo. parva is not synonymous with Nitzschia reversa and Nitzschia palea var. tenuirostris is not synonymous with Nitzschia capitellata. Accordingly we have not incorporated these changes to the list.

32. Krammer (1992) transferred Pinnularia interrupta var. crassior (Grunow) Cleve to Pinnularia lindii Krammer. The concept of P. interrupta var. crassior carried at the Center for Great Lakes and Aquatic Sciences (fromerly the Great Lakes Research Division) is more consistent with Pinnularia subrostrata ( A.Cleve) A.Cleve. Records from the Center for Great Lakes and Aquatic Sciences for P. interrupta var. crassior should be considered P. subrostrata, not P. lindii. Without further investigation we refrain from following the synonomy proposed by Van Landingham (1978)for P. subrostrata.

33. These Staruosira designations are not in accordance with the modern usage of Williams & Round 1987. They are from the first checklist (Stoermer and Kreis 1978) and represent literature reports of Staurosira.

34. Krammer suggests Cymbella ventricosa C.Agardh contains the concepts of both Encyonema silesacum (Bleisch in Rabenh.) D.G.Mann in Round, Crawford & Mann pro parte and Encyonema minutum (Hilse in Rabenh.) D.G.Mann in Round, Crawford & Mann pro parte. Accepting Krammer's suggestion requires individual examination of Cymbella ventricosa records to ascertain the appropriate Encyonema designation.

35. The original checklist (Stoermer and Kreis 1978) placed Gyrosigma spenceri var. nodiferum in synonymy with Gyrosigma nodiferum. Reimer in Patrick and Reimer (1966) created a new combination Gyrosigma nodiferum based on Gyrosigma spenceri var. nodiferum. Sterrenberg (1994) claims Gyrosigma nodiferum is his Gyrosigma reimeri. Additionally, Sterrenberg (1994) asserts the concept of Gyrosigma spenceri var. nodiferum (as Gyrosigma nodiferum) in Krammer and Lange-Bertalot 1986 differs from that of Reimer in Patrick and Reimer (1966). Gyrosigma nodiferum (Gyrosigma spenceri var. nodiferum) in Krammer and Lange-Bertalot 1986 is more properly Gyrosigma sciotoense while Gyrosigma nodiferum (Gyrosigma spenceri var. nodiferum) in Patrick and Reimer (1966) is Gyrosigma reimeri. Reports prior to 1966 containing Gyrosigma spenceri var. nodiferum should be examined to determine which concept should apply and reports after 1986 also need re-examination to determine which concept should apply, i.e. Gyrosigma reimeri or Gyrosigma sciotoense.