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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium subtumidum
var. klebsii (Gutwinski) W. et G.S. West

Cosmarium subtumidum Species [var. subtumidum]: Cell body (28-39)-40 μm long, 21-33.6 μm wide, isthmus 7-(8.5-14) μm wide.
[var. rotundum Hirano ]: Cell body 29-30 μm long, 21 μm wide, isthmus 7 μm wide.
[var. klebsii (Gutwinski) W. et G.S. West ]: Cell body 31-47 μm long, 31-43 μm wide, isthmus 8.5-12 μm wide.
[f. minor Ström ]: Cell body 11-25 μm long, 11-20 μm wide, isthmus 4.2-5.6 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium subtumidum var. klebsii (Gutwinski) W. et G.S. West, cell body 50 μm long, 40 μm wide, L/W=1.3, isthmus 18 μm wide, x 640, a pond near the entrance of climbing route to Omine mountain, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium subtumidum

Images of collecting locality: a pond near the entrance of climbing route to Omine mountain, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii

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