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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium taxichondrum
Lundell var. magnum Hirano
Cosmarium taxichondrum 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 ]: Cell body 78-84 μm long, 78-80 μm wide, isthmus 39-44 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >> C. obsoletum;
Cosmarium taxichondrum Lundell var. magnum Hirano, cell body 86.5 μm long, 89 μm wide, L/W=1.0, isthmus 50 μm wide, x 640, Koigakubo marsh, Tessei-cho, Niimi city, Okayama Pref., Japan, September 23, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium taxichondrum Cosmarium taxichondrum Cosmarium taxichondrum

Images of collecting locality: Koigakubo marsh, Tessei-cho, Niimi city, Okayama Pref., Japan, September 23, 2006 by Y. Tsukii

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