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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium macilentum
Brébisson var. macilentum

Closterium macilentum Species [var. macilentum ]: Cell body large, elongated, both side nearly straight at central region, slightly tapered and curved toward ends, 260-(432-678)-800 μm long, 11-(14-21)-25 μm wide, L/W=25-40; cell wall smooth, transparent, bands present; 6-15 pyrenoids in each semicell.
[ var. japonicum ]: Cell body wider at the center and narrower at ends than var. macilentum, 400-(447-5780-600 μm long, 23-(32-34) μm wide, L/W=12-18 (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium macilentum Brébisson var. macilentum ?, cell body 640 μm long, 15 μm wide, L/W=42.7, x 200, x 400, x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium lineatum Closterium lineatum Closterium lineatum
Closterium lineatum Closterium lineatum Closterium lineatum
Cell body 752 μm long, 14.5 μm wide, L/W=51.9, x 100, x 200, x 400, x 640
Closterium gracile Closterium gracile Closterium gracile Closterium gracile Closterium gracile

Images of collecting locality: Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008 by Eizaburo Tsukii

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