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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium curtum
(Brébisson) Ralfs
= Actinotaenium curtum (Ralfs) Teiling
Syn: Penium curtum (Ralfs) Brébisson

Cosmarium curtum Section [ Actinotaenium ]: Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, 22-(32-43)-60 μm long, 10.5-(20-23)-32 μm wide, isthmus 9.5-(18-21.5)-30 μm wide, L/W=2; semicells ovoidal; (Illustrations of the Japanese Fresh-water Algae, 1977).

Cosmarium curtum (Brébisson) Ralfs ??, cell body foot-ball-shaped, 40 μm long, 20 μm wide, x 640, Fukasaku-gawa Yusuichi, Saitama city, Saitama Pref., Japan, May 2002 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium curtum Cosmarium curtum Cosmarium curtum Cosmarium curtum
Cosmarium curtum Cosmarium curtum

A parasitic fungus ? infecting Cosmarium curtum (Brébisson) Ralfs ??, x 640, Fukasaku-gawa Yusuichi, Saitama city, Saitama Pref., Japan, May 2002 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium curtum Cosmarium curtum Cosmarium curtum

Cosmarium curtum (Brébisson) Ralfs: Cell body small, 22-(32-43)-60 μm long, 10.5-(20-23)-32 μm wide, isthmus 9.5-(18-21.5)-30 μm wide, L/W=2; semicells ovoidal; (Illustrations of the Japanese Fresh-water Algae, 1977).

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