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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium punctulatum
var. rotundatum Klebs
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 var. rotundatum Klebs, cell body 36 μm long, 30 μm wide, L/W=, isthmus 15 μm wide, x 640, wetland at Ichinose-enchi, Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

Images of collecting locality: a wetland at Ichinose-enchi, Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

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