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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium cornu
Ehrenberg var. cornu

Closterium cornu 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. cornu]: Cell body slightly curved, tapered at both ends, but inner side at center straight, 95-160 μm long, 5-(7.8-13) μm wide, L/W = 16-17; cell wall smooth; chloroplasts with 3-4 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium cornu Ehrenberg ?, cell body (lower) 170 μm long, 11 μm wide, L/W=15.4, x 400, x 640, standing water near Akaiyaji-shoya-shokubutu-gunraku (Akai wetland), Aizuwakamatsu city, Fukushima Pref., Japan, May 4, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium
Cell body (left) 205 μm long, 11.5 μm wide, L/W=17.8, x 400, x 640
Closterium Closterium
Cells undergoing conjugation, μm long, μm wide, L/W=, x 640
Closterium Closterium Closterium Closterium

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