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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium sexangulare
Lundell var. sexangulare

Cosmarium sexangulare 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 (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, (25-36.4)-42 μm long, (22.6-28)-36 μm wide, isthmus (7-9.7)-12 μm wide; (Illustrations of the Japanese fresh-water algae, 1977).
Similar species -->> Cosmarium rectangulare (Quadratiformes);

Cosmarium sexangulare Lundell var. sexangulare ?, (or C. subrectangulare Gutwinski ?), cell body 38 μm long, 29 μm wide, L/W=1.3, isthmus 9 μm wide, x 640, a small pond at Obihiro University of Agriculture and Veterinary Medicine, Obihiro city, Hokkaido, Japan, October 13, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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