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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium scopulorum
Borge

Cosmarium scopulorum 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 octagonal in shape, 23-24 μm long, 17-18 μm wide, isthmus 5.6 μm wide, L/W=1.4; semicells nearly hexagonal; cell wall smooth; apical view elliptical (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium scopulorum Borge (or C. laeve ?), cell body 29 μm long, 18 μm wide, L/W=1.6, isthmus 6.5 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
Cosmarium scopulorum Cosmarium scopulorum Cosmarium scopulorum

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