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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium portianum
f. major Borge

Cosmarium portianum Section [ Ornatae ]: Semicells circular, ellipsoid, reniform; cell surface granulated or spiny (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body (52)-66-79 μm long, (42)-57-60 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium portianum f. major Borge ?, cell body twisted, 46 μm long, 35 μm wide, isthmus 16 μm wide, x 400, x 640, Imou bog, Toyohashi city, Aichi Pref., Japan, September 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium Cosmarium

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