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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium parvulum
Brébisson

Cosmarium Species: Cell body small, (20-22)-42 μm long, (10.5-11)-17 μm wide, L/W=2-2.5; slightly depressed at the center; semicells gradually attenuated toward apex, lateral margins nearly straight, apex flat with rounded corners; cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium parvulum Brébisson (or C. cucurbita ?), cell body 48 μm long, 19 μm wide, L/W=2.5, isthmus 18 μm wide, x 640, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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