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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 15.5 μm long, 13 μm wide, isthmus 3.5 μm wide, x 640, Aquatic botanical garden, Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

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