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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 37 μm long, 30 μm wide, L/W=1.2, isthmus 9 μm wide, x 640, rice field, near Ichinoseki Railroad Station, Ichinoseki city, Iwate Pref., Japan, July 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium rectangulare Cosmarium rectangulare

Cosmarium rectangulare Grunow var. rectangulare (Quadratiformes, Eucosmarium), cell body 42 μm long, 31 μm wide, L/W=1.6, isthmus 12 μm wide, x 640, rice field, near Ichinoseki Railroad Station, Ichinoseki city, Iwate Pref., Japan, July 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium rectangulare


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