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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium logiense
f. expansa W. et G.S. West

Cosmarium logiense Species[ var. logiense]: Cell body slightly longer than width, 59-65 μm long, 48-53 μm wide, isthmus 16-22.4 μm wide; semicells reniform, basal corners rounded, with 2 pyrenoids. [f. expansa]: Cell body slightly longer than width, 64.4-67 μm long, 50.4-53 μm wide, isthmus 16.8-18 μm wide; semicells reniform, basal corners rounded, apex broader than that of var. logiense; cell wall covered with many granules (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium logiense f. expansa W. et G. S. West, cell body 71 μm long, 58 μm wide, L/W=, x 640, No. 1, Miyatoko marsh, Minami-Aizu town, Fukushima Pref., Japan, June 15, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium
Cell body μm long, μm wide, L/W=, x 640
Cosmarium Cosmarium Cosmarium

Images of collecting locality: No. 1, Miyatoko marsh, Minami-Aizu town, Fukushima Pref., Japan, June 15, 2008 by Y. Tsukii

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