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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium punctulatum
Brébisson punctulatum
Cosmarium punctulatum 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[ punctulatum ]: Cell body 34-41 μm long, 31-35 μm wide, isthmus 8-10 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).
Cosmarium punctulatum Brébisson punctulatum (or C. orthosticum Lundell var. subpolonica Messikommer ??), cell body 28 μm long, 16 μm wide, L/W=1.8, isthmus 10 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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