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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium acutum
var. variabile (Lemmermann) Krieger

Closterium Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded; cell wall smooth or with longitudinal lines, bands on the cell wall in some species; chloroplast laminae ridged and radially arranged, which makes cross section star-shaped; pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [var. variabile]: Cell body strongly curved, nearly semicircular, 43-140-(150) μm long, 2.5-5-(6) μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).


Closterium acutum var. variabile (Lemmermann) Krieger, cell body μm long, μm wide, x 640, Higusa-numa (swamp), Miyakawa, Hikari town, Chiba Pref., Japan, September 2003 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
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