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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium sp.

Cosmarium regnellii 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: (Illustrations of the Japanese fresh-water algae, 1977).

Cosmarium sp. (similar to C. hammeri Reinsch ), cell body 47 μm long, 29 μm wide, isthmus 15 μm wide, x 400, x 640, Riverside green land (near Tone river), Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

Cosmarium regnellii Will var. regnellii: Cell body small, (14-18)-22 μm long, (11-16.8)-22 μm wide, isthmus (11-16.8)-22 μm wide; (Illustrations of the Japanese fresh-water algae, 1977).

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