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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 Penium ?), cell body 28 μm long, 12.5 μm wide, L/W=2.2, x 640, Koigakubo marsh, Tessei-cho, Okayama Pref., Japan, November 22, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium


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