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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium cucurbita
Brébisson var. attenuatum
= Actinotaenium cucurbita (Brébisson) Teiling var. attenuatum

Cosmarium cucurbita Section [ Actinotaenium ]: Cell body cylindrical, slightly constricted at the center, cell surface smooth or dotted or punctated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [var. attenuatum G.S. West ]: Cell body cylindrical, 29-51 μm long, 15-24 μm wide, L/W=2-2.5; slightly constricted at the center; lateral margins slighlty convex, attenuated toward apex; cellwall dotted.
[var. latius (W. et G.S. West) Gerloff ]: Cell body cylindrical, 39-42 μm long, 21-27 μm wide, L/W less than 2.0 (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium cucurbita Brébisson var. attenuatum G.S. West, cell body 63 μm long, 29 μm wide, L/W=2.2, isthmus 28.5 μm wide, x 640, Kamino-tanbo (bog/marsh), Tsugaike highland (near Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium
Cell body 59 μm long, 21.5 μm wide, L/W=2.7, isthmus 19 μm wide, x 640,
Cosmarium

Images of collecting locality: Kamino-tanbo (bog/marsh), Tsugaike highland (near Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii

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