Stauroneis anceps f. gracilis Rabh. 1864




Collection 1174a

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Authority information

Ravh., Fl. Europaea Alg., sect. 1, p. 247. 1864. (Patrick and Reimer 1966).

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  • Synonyms (Patrick and Reimer 1966)
    Stauroneis anceps var. gracilis Brun, Diat. Alpes Jura, p. 89, pl. 9, fig. 2. 1880.

  • Ecology
    Occurs with the nominate variety. (Patrick and Reimer 1966).

    Size ranges and morphology

  • Length is 40-55 micrometers (Patrick and Reimer 1966).
  • Breadth is 8-10 micrometers (Patrick and Reimer 1966).
  • Striae usually not coarser than 26 in 10 micrometers (Patrick and Reimer 1966).
  • Note: The size ranges given by Patrick and Reimer differ from the measurements of our specimen.

  • Other morphological features:
    Valve elongate, elliptical-lanceolate with extremely narrowed capitate ends; otherwise
    as variety anceps. (Patrick and Reimer 1966).