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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium praelongum
Brébisson var. brevius Nordstedt

Closterium praelongum Species [var. praelongum]: Cell body 380-885 μm long, 11-26 μm, L/W = 22-24; slightly curved but straight at the center, tapered at both ends; curveture reversed at both ends, cell wall finely striated.
[var. brevius Nordstedt ]: Cell body shorter than v. praelongum, 198-360 μm long, 13-24 μm, L/W = 10-22.
[var. porosum (Gutwinski) Krieger ]: Cell body 120-557 μm long, 18-24 μm, L/W = 10-22; cellwall finely dotted, (Illustrations of the Japanese Fresh-Water Algae, 1977).

Closterium praelongum var. brevius Nordstedt ?, cell body 342 μm long, 15 μm wide, L/W=, x 400, x 640, Oyachi marsh, Iizuna-kogen (Iizuna Highland), Nagano city, Nagano Pref., Japan, May 21, 2006 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 praelongum Closterium praelongum Closterium praelongum
Cell body 300 μm long, 15.5 μm wide, L/W=, x 400, x 640
Closterium praelongum Closterium praelongum Closterium praelongum

Images of collecting locality: Oyachi marsh, Iizuna-kogen (Iizuna Highland), Nagano city, Nagano Pref., Japan, May 21, 2006 by Y. Tsukii

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