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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium rectangulare
Grunow var. rectangulare

Cosmarium rectangulare Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation
Subgenus [Eucosmarium]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [Quadratiformes]: Cell surface smooth; semicells rectangular (Illustrations of The Japanese Fresh-water Algae, 1977).

Species:
Similar species --> > C. succisum;


Cosmarium rectangulare Grunow var. rectangulare (Quadratiformes, Eucosmarium), cell body 40 μm long, 30 μm wide, isthmus 10 μm wide, x 640, rice field, Konuma, Sakado city, Saitama Pref., Japan, July 18, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium


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