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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium portianum
W. Archer var. portianum

Cosmarium portianum Section [ Ornatae ]: Semicells circular, ellipsoid, reniform; cell surface granulated or spiny (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:


Cosmarium portianum W. Archer var. portianum ?, cell body 34 μm long, 26 μm wide, isthmus 11 μm wide, x 640, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, August 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium portianum Cosmarium portianum Cosmarium portianum Cosmarium portianum Cosmarium portianum Cosmarium portianum Cosmarium portianum


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