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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium notabile
Brébisson f. arcticum Kossinskaja

Cosmarium notabile Section [Margaritiferae]: Cell surface granulated, gnarled or spiny; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [f. arcticum]: Cell body 35 μm long, 24 μm wide, isthmus 12.6 μm wide, both sides with 6 waves (including basal and apical corners), apex with 2 corners and 2 waves (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium notabile Brébisson f. arcticum Kossinskaja, cell body 29 μm long, 21 μm wide, L/W=1.4, isthmus 8 μm wide, x 640, drainage ditch near Tanohara Natural Park, Ontake highland, Otaki town, Nagano Pref., Japan, June 26, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium notabile Cosmarium notabile Cosmarium notabile

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