Pinnularia obscura Krasske




Collection 1781a

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Pinnularia obscura Krasske, Hedwigia, 72(3):117, pl. 3, fig. 22. 1932(Patrick and Reimer 1966).

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This image was taken utilizing DIC.

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Valve linear with somewhat rostrate, wedge-shaped ends, or liear-elliptical with rounded ends. Axial area narrow. Central area a broad, transverse fascia. Striae radiate toward the middle of the valve, strongly convergent at the ends(Patrick and Reimer 1966).

  • Type Locality
    Vereinzelt an nassen Felsen an der neuen Autostrasse im Stubachtale [Hohen Tauern, Austrian Alps](Patrick and Reimer 1966).

  • Synonyms
    Navicula gentilis Donk., Nat. Hist. British Diat., p. 69, pl. 12, fig. 1. 1870-1873(Patrick and Reimer 1966).

  • Ecology
    Found in a wide variety of fresh waters, often associated with moss.(Patrick and Reimer 1966; Beaver 1981).

    Size ranges and morphology

  • Length is 12 to 22 micrometers (Patrick and Reimer 1966).
  • Width is 3 to 5 micrometers (Patrick and Reimer 1966).
  • Striae are 13 to 15 in 10 micrometers (Patrick and Reimer 1966).