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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium intermedium
var. hibernicum W. et G.S. West

Closterium intermedium Species [var. intermedium]: Cell body slightly curved, central region not swelled (inner side slightly concave), both ends broadly truncated with slanted edges, 76-(200-300)-470 μm long, 14-(17-22)-25 μm wide, L/W=6-15; cell wall brownish in color, with bands and lined (6-10 lines within 10 μm)
[var. hibernicum]: Cell body straight at central region, 200-(350)-384 μm long, 14-(26) μm wide, L/W=; (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium intermedium var. hibernicum W. et G.S. West (?), cell body 360 μm long, 25 μm wide, L/W=14.4, x 200, x 400, x 640, a pond near the entrance of climbing route to Omine mountain, Minakami town, Gunma Pref., Japan, October 21, 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 intermedium Closterium intermedium Closterium intermedium Closterium intermedium Closterium intermedium

Images of collecting locality: a pond near the entrance of climbing route to Omine mountain, Minakami town, Gunma Pref., Japan, October 21, 2007 by Y. Tsukii

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