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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium ulna
Focke

Closterium ulna Species [ var. ulna ]: Cell body slightly curved, both lateral margins parallel, slightly tapered toward ends, both ends broadly truncated, 170-(192-462)-500 μm long, 10- (11-22)-23 μm wide, L/W=15-20; cell wall brownish in color, striated (10-11/10 μm), bands present; 6-15 pyrenoids in each semicell.
[ var. recurvatum ]: Thinner than var. ulna, recurved at both ends, 248-(298)-345 μm long, 9-11-(18) μm wide, L/W=30; cell wall smooth without striae (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium ulna Focke, cell body μm long, μm wide, L/W=, x 200, x 400, x 640, No.2a, a marsh pond at Mitsuishi marsh, Hachimantai city, Iwate Pref., Japan, August 13, 2008 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium ulna Closterium ulna Closterium ulna Closterium ulna Closterium ulna Closterium ulna
Cell body μm long, μm wide, L/W=, x 200, x 400, x 640
Closterium ulna Closterium ulna Closterium ulna Closterium ulna Closterium ulna

Images of collecting locality: No.2, a marsh pond at Mitsuishi marsh, Hachimantai city, Iwate Pref., Japan, August 13, 2008 by Y. Tsukii

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