Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium rectangulare
Grunow var. 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:
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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
31 μm
63 μm
94 μm; x 640
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
31 μm
63 μm
94 μm; x 640
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