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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 μm long, μm wide, L/W=, isthmus μm wide, x 640, No.5, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 21, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium portianum Cosmarium portianum Cosmarium portianum

Images of collecting locality: No.5, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 21, 2007 by Y. Tsukii

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