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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium macilentum
var. japonicum (Suringar) Grönblad

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; cell wall finely striated (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. kuetzingii; C. subulatum; C. rostratum;

Closterium macilentum var. japonicum (Suringar) Grönblad or C. praelongum ?, cell body 450 μm long, 21 μm wide, L/W=21.4, x 200, x 400, x 640, a wetland near Tamogi-ike (water reservoir), Nabekura highland, Iiyama city, Nagano Pref., October 19, 2008, 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 macilentum Closterium macilentum Closterium macilentum Closterium macilentum Closterium macilentum

Images of collecting locality: a wetland near Tamogi-ike (water reservoir), Nabekura highland, Iiyama city, Nagano Pref., October 19, 2008, by Y. Tsukii

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