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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium abruptum
W. West

Closterium abruptum Species: Cell body 100-(193-310) μm long, 11-22 μm wide, L/W=9-17; inner side nearly straight, both termini broadly blunted; cell wall smooth, transparent or yellowish in color, bands present; chloroplasts with 4-6 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
160-280 μm long, 10-20 μm wide, L/W=18-19; slightly curved, gradually attenuated toward both ends with obliquely truncated edges; chloroplasts with 4-9 pyrenoids (Photomicrographs of the Freshwater Algae, vol.1, 1984).

Closterium abruptum W. West var. abruptum ?, cell body 179 μm long, 16 μm wide, L/W=11.2, x 640, Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium
Cell body 157 μm long, 17 μm wide, L/W=9.2, x 400, x 640
Closterium Closterium Closterium
Cell body 180 μm long, 18 μm wide, L/W=10.0, x 400, x 640
Closterium Closterium Closterium
Cell body 215 μm long, 17 μm wide, L/W=12.6, x 400, x 640
Closterium Closterium Closterium

Images of collecting locality: Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii

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