Pinnularia obscura Krasske
Length:26

 Width:5

 Striae:16






























Collection 1781a

 Other images

 More information



Return to Top Page Return to Genera List Return to Species List

Authority information

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

Other images



This image was taken utilizing DIC.


More information


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).