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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium petsamoense
Cedercreutz
Cosmarium petsamoense Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species[ var. simplicius ]: Cell body μm long, μm wide, isthmus μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >> C. obsoletum;
Cosmarium petsamoense var. simplicius Kossinskaja (or Cosmarium subortogonum Raciborski ?), cell body 34 μm long, 26 μm wide, isthmus 10 μm wide, x 640, wetland at Ichinose-enchi, Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium petsamoense

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