Pinnularia undulata v. subundulata (Greg.) Cleve
Length:23

 Width:5

 Striae:20






























Collection 1788

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Pinnularia undulata v. subundulata Grunow in Van Heurck 1880-1885, Type No. 140(VanLandingham, S. L. 1971).

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This image was taken using DIC.


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Valve linear, with triundulate to almost parallel sides. Ends broadly capitate, blunt or flatly rounded. Raphe slightly filiform, small central pores. Ends of fissures distinctly question mark shaped. Axial area narrow and linear. Fascia of varied breadth, small and round. Striae parallel to radial end, slightly to strongly bent, crossed by the marginalband(Krammer and Lange-Bertalot (2/1) 1986).


  • Ecology
    Found in northern alpine waters, oligotrophic and electrolyte poor(Krammer and Lange-Bertalot (2/1) 1986)).

    Size ranges and morphology

  • Length is 22 to 39 micrometers (Krammer and Lange-Bertalot (2/1) 1986).
  • Width is 5 to 7 micrometers (Krammer and Lange-Bertalot (2/1) 1986).
  • Striae are 17 to 22 in 10 micrometers (Krammer and Lange-Bertalot (2/1) 1986).