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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium pandriforme
Turner

Cosmarium pandriforme Subgenus [Eucosmarium]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Cyclidium ]: Cell surface smooth; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species[ magnum ]: (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium pseudopyramidatum Lundell, cell body 59 μm long, 37 μm wide, L/W=1.6, isthmus 15 μm wide, x 640, Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, July 3, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum

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