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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium gracile
Brébisson ex Ralfs 1848

Closterium gracile 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 90-(155-272)-275 μm long, (4-7)-8 μm wide, L/W = 25-40; slightly curved but straight at the center, tapered at both ends; cell wall smooth without bands (Illustrations of the Japanese Fresh-Water Algae, 1977).


Chlosterium gracile (or C. acutum var. acutum ?), cell body 140 μm long, 4.5 μm wide, L/W=31, x 640, a pond at Takezono-higashi park, Tsukuba city, Ibaraki Pref., Japan, October 2003 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Closterium Closterium


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