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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 41.5 μm long, 18.5 μm wide, L/W=2.2, isthmus 17 μm wide, x 640, No.1, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium oblongum Cosmarium oblongum Cosmarium oblongum

Images of collecting locality: No.1, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii


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