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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 396 μm long, 16 μm wide, L/W=24.8, cell wall lined, x 200, x 400, x 640, Shimo-no-koike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 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 toxon Closterium toxon Closterium toxon
x 640
Closterium toxon Closterium toxon Closterium toxon Closterium toxon Closterium toxon

C. toxon W. West: Cell body slightly curved, 163-(190-350) μm long, 8-(8.4-13)-20 μm wide, L/W = 25-33; both termini broadly rounded (nearly truncated); cell wall transparent, smooth; 5-7 pyrenoids arranged in a single line (Illustrations of The Japanese Fresh-water Algae, 1977).

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