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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium pronum

Closterium pronum 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
Species: Cell body elongated spindle-shaped, μm long, μm wide, L/W= ;

Closterium pronum , cell body 275 μm long, 6 μm wide, L/W=45.8, x 400, x 640, Aquatic botanical garden, Sawara city, Chiba Pref., Japan, October 11, 2004 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 gracile Closterium gracile Closterium gracile
Cell body 273 μm long, 6 μm wide, L/W=45.5, x 400, x 640
Closterium gracile Closterium gracile Closterium gracile
Cell body 275 μm long, 6 μm wide, L/W=45.8, x 400, x 640
Closterium gracile Closterium gracile Closterium gracile

C. gracile T. West: 390-(430-580)-800 μm long, 4-(5-7)-8 μm wide, L/W = 73-135; cell body very long, slightly curved, tapered at both termini; cell wall transparent, lack bands

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