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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium polonicum
Raciborski

Cosmarium turpinii 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 20-28 μm long, 19-22.4 μm wide, isthmus 6-8.4 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species-->> C. furcatospermum; C. formosulum; C. meneghinii (Microcosmarium);

Cosmarium polonicum Raciborski (or C. furcatospermum W. et G.S. West var. furcatospermum ?), cell body 20 μm long, 17 ? μm wide, L/W=1.3, isthmus 6 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 Cosmarium Cosmarium

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