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Gamophyceae: Zygnematales: Desmidiaceae

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

Cosmarium subcostatum Section [Margaritiferae]: Cell surface granulated, gnarled or spiny; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [var. subcostatum]: Cell body 26-38 μm long, 23-32 μm wide, isthmus 6.5-12 μm.
[f. minor W. et G.S. West]: Cell body 19-26 μm long, 18-23 μm wide, isthmus 4.5-9 μm.
Similar species -->> C. furcatospermum;

Cosmarium subcostatum Nordstedt f. minor W. et G.S. West ?, cell body 17 μm long, 16 μm wide, L/W=1.1, isthmus 5 μm wide, x 640, Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, June 12, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium

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