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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, small variety ??, cell body 29 μm long, 24 μm wide, x 640, Tone river, near Jomo-kogen railway station, Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium vexatum Cosmarium vexatum
Cell body 31 μm long, 24 μm wide, x 640
Cosmarium vexatum Cosmarium vexatum


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