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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium tumidum

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Closterium tumidum 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 small, slightly curved, slightly swelled at the center, 60-160 μm long, 7-20 μm wide, L/W=6-9; both ends truncated; cell wall smooth, transparent; semicells with 1-4 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium tumidum Johnson, cell body 100 μm long, 17 μm wide, L/W=5.9, x 640, Omuta-ike (pond), Kasuga city, Fukuoka Pref., Japan, October 2001 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
Closterium Closterium Closterium
Closterium Closterium Closterium

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