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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Closterium toxon
W. West

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: Cell body slightly curved, 163-(190-350) μm long, 8-(8.4-13)-20 μm wide, L/W = 25-33; both termini broadly rounded (nearly truncated); cell wall transparent, smooth; 5-7 pyrenoids arranged in a single line (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium toxon W. West, tape No. 0056, time code 0112, cell body 225 μm long, 12 μm wide, L/W = 19, both termini truncated, semicells with 10-11 pyrenoids arranging in a single line, Hiroshima Pref., Japan, September, 1998 by Y. Tsukii

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