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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium punctulatum
Brébisson var. 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 var. punctulatum, cell body 35.5 μm long, 32.5 μm wide, L/W=1.1, isthmus 11 μm wide, x 640, No. 2-3, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

Images of collecting locality: No. 1, 2, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii

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