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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium subtumidum
Nordstedt var. subtumidum

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 Nordstedt var. subtumidum (Pyramidatae), cell body 27 μm long, 22 μm wide, x 640, near Eai-gawa (Eai river), Ishinazaka, Furukawa city, Miyagi Pref., Japan, November 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium


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