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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium quinarium
P. Lundell

Cosmarium quinarium 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 39-(42-43) μm long, 33-24 μm wide, constriction 9.5-(11-12.7) μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium quinarium P. Lundell ?, cell body 45 μm long, 36 μm wide, L/W=1.3, isthmus 10 μm wide, x 640, Kamitashiro, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, June 29, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium

Images of collecting locality: Kamitashiro, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, June 29, 2006 by Y. Tsukii

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