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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium acerosum
(Schrank) Ehrenberg ex Ralfs 1848

Closterium acerosum Species: 250-(396-576)-790 μm long, 25-(33-84) μm wide; cell body large, slightly curved; both termini tapered; pyrenoids 7-15 in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body slightly curved, gradually attenuated toward the truncated ends, which somewhat recurved due to the covexity of the inner margin near the ends; inner margin straight or slightly concave, outer margin convex, 300-500 μm long, 32-50 μm wide, L/W=9-14; cell wall smooth and colorless or sometimes delicately striated and yellowish-brown in color; chloroplasts with ridges containing 7-11 pyrenoids in central row (Photomicrographs of the Freshwater Algae, vol. 1, 1984).


Closterium acerosum var. acerosum, cell body 388 μm long, 38 μm wide, L/W=10.2, x 200, x 400, x 640, Akasaka-numa (pond), Iwatsuki-ku (formerly Iwatsuki city), Saitama city, Saitama Pref., Japan, April 9, 2006 by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200
Closterium acerosum Closterium acerosum Closterium acerosum Closterium acerosum Closterium acerosum

Images of collecting locality: Akasaka-numa (pond), Iwatsuki-ku (formerly Iwatsuki city), Saitama city, Saitama Pref., Japan, April 9, 2006 by Y. Tsukii


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