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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium sp.

Cosmarium 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 sp., outline shape similar to C. depressum but cell surface granulated not smooth, cell body 23 μm long, 23 μm wide, L/W=1.0, isthmus 7 μm wide, x 640, a water reservoir (pond) near Yamaguchi university, Yamaguchi city, Yamaguchi Pref., November 21, 2004, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

Cosmarium ozense Hirano: Cell body 17-18 μm long, 18-18.5 μm wide, isthmus 7 μm wide; semicells rectangular (Illustrations of the Fresh-water Algae, 1977).

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