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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium repandum
Nordstedt f. minor W. et G.S. West

Cosmarium repandum 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:

Cosmarium repandum Nordstedt f. minor W. et G.S. West, cell body 19 μm long, 16 μm wide, L/W=1.2, isthmus 4 μm wide, x 640, Southern lakeside of Lake Shirakaba, Tateshina town & Chino city, Nagano Pref., Japan, May 21, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium repandum

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