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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 26 μm long, 21 μm wide, L/W=, isthmus 6 μm wide, x 640, Ohnuma (a pond in Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, May 5, 2006, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium subcostatum Cosmarium subcostatum

Images of collecting locality: Ohnuma (a pond in Ohnuma enchi), Nasu-shiobara city (formerly Shiobara town), Tochigi Pref., Japan, May 5, 2006, by Y. Tsukii


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