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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium pachydermum
Lundell

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 (var. pachydermum): Cell body 78-117 μm long, 60-87 μm wide, isthmus 25-34 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium pachydermum Lundell var. pachydermum, tape No. 0067, time code 0430, Japan, Month Day, Year by Y. Tsukii


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