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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium lanceolatum
Kützing

Closterium lanceolatum 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, inner-side nearly straight; L/W= 6-8; cell wall smooth, transparent; chloroplasts with 5-10 laminae; 6-8 pyrenoids in each semi-cell; 200- (240-400) -540 μm long, 28- (30-52) -79 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium lanceolatum Kützing, cell body 217 μm long, 40 μm wide, L/W=, x 400, x 640, water plant garden at General Athletic Park, Nishikawada, Utsunomiya city, Tochigi Pref., Japan, January 4, 2007 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 lanceolatum Closterium lanceolatum Closterium lanceolatum
Cell body 220 μm long, 38 μm wide, L/W=, x 400, x 640
Closterium lanceolatum Closterium lanceolatum Closterium lanceolatum
Cell body 215 μm long, 38 μm wide, L/W=, x 400, x 640
Closterium lanceolatum Closterium lanceolatum Closterium lanceolatum Closterium lanceolatum
Cell body 265 μm long, 39 μm wide, L/W=, x 400, x 640
Closterium lanceolatum Closterium lanceolatum Closterium lanceolatum Closterium lanceolatum

Images of collecting locality: water plant garden at General Athletic Park, Nishikawada, Utsunomiya city, Tochigi Pref., Japan, January 4, 2007 by Y. Tsukii

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