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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 41 μm long, 31 μm wide, L/W=1.3, isthmus 15 μm wide, x 640, No. 2-3, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium

Images of collecting locality: No. 1, 2, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii

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