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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 182 μm long, 16 μm wide, L/W=11.3, x 400, x 640, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium Closterium
Cell body 165 μm long, 15 μm wide, L/W=, x 400, x 640
Closterium Closterium Closterium
Cell body 162 μm long, 15 μm wide, L/W=, x 640
Closterium Closterium

Images of collecting locality: No. 3, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii

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