 
 
Gamophyceae: 
Zygnematales: Desmidiaceae
Cosmarium portianum
W. Archer var. portianum
|  Section [ Ornatae ]: 
Semicells circular, ellipsoid, reniform; cell surface granulated or spiny 
(Illustrations of The Japanese Fresh-water Algae, 1977). Species:
 | 
Cosmarium portianum W. Archer var. portianum ?, 
cell body  μm long,  μm wide, L/W=, isthmus  μm wide, 
x 640, a pond near the entrance of climbing route to Omine mountain, Minakami town, Gunma Pref., Japan, October 21, 2007 by Y. Tsukii
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 94 μm; x 640
 
 
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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