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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium acerosum
var. minus Hantzsch

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).


Chlosterium acerosum (Schrank) Ehrenberg var. acerosum, cell body 490 μm long, 40 μm wide, L/W=12.9, cell wall striated (see 20.jpg and 21.jpg), x 200, x 400, x 640, rice field, Shimo-muneoka, Shiki city, Saitama Pref., Japan, October 24, 2004 by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200
Closterium acerosum Closterium acerosum Closterium acerosum
x 640
Closterium acerosum Closterium acerosum Closterium acerosum Closterium acerosum


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