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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium ocellatum
var. grabrum Hinode

Cosmarium ocellatum Section [ Cyclidium ]: Cell surface smooth; semicells half circle, half ellipsoid.
Species [ var. ocellatum ]: Cell body (20-28)-30 μm long, 17-20-25 μm wide, isthmus 4-(4.8-5.6)-6 μm wide; [ var. grabrum Hinode ]: Cell body 25-26 μm long, 24-25 μm wide, isthmus 6-7 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium ocellatum var. glabrum Hinode, cell body 26 μm long, 25 μm wide, L/W=1.0, isthmus 6 μm wide, x 640, Aka-ike (pond), Madarao highland (Niigata & Nagano Pref.), Myoko city (formerly Myoko village), Niigata Pref., Japan, June 17, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium
Cell body 25.5 μm long, 22 μm wide, L/W=1.2, isthmus 8 μm wide, x 640
Cosmarium

Images of collecting locality: Aka-ike (pond), Madarao highland (Niigata & Nagano Pref.), Myoko city (formerly Myoko village), Niigata Pref., Japan, June 17, 2006 by Y. Tsukii

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