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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 ?, cell body 37 μm long, 30 μm wide, L/W=1.2, isthmus 10 μm wide, x 640, No. 2 & No. 4, Iroha-numa (marsh/bog), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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Cell body 36.5 μm long, 29 μm wide, L/W=1.3, isthmus 10 μm wide, x 640
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Images of collecting locality: No. 4, Iroha-numa (marsh/bog), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii

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