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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium vexatum
W. West

Cosmarium vexatum Species: cell body medium in size, slightly shorter than its width, bay closed, 41-43 μm long, (35)-38 μm wide, isthmus (11.5)-14 μm wide; semicells pyramidal in shape with truncated apex, basal corners rounded, lateral margins slightly convex; cell wall covered with many granules arranging radially at periphery of the semicells, central region smooth (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium vexatum W. West, cell body 51 μm long, 42 μm wide, L/W=1.2, isthmus 13 μm wide, x 640, standing water, Juro, Akanuma, Hatoyama town, Saitama Pref., Japan, December 19, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium Cosmarium


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