Gamophyceae: 
Zygnematales: Desmidiaceae
Cosmarium lundellii
Delponte var. circulare (Reinsch) Krieger
 
Genus: Unicellular; variable in shape; a constriction at the center of the cell body; 
mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, 
rectangular, pyramidal or kidney-shaped; no apical indentation 
(Illustrations of The Japanese Fresh-water Algae, 1977). 
 
Species:  
(Illustrations of The Japanese Fresh-water Algae, 1977). 
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Similar species -->>
	C. pachydermum; 
Cosmarium lundellii Delponte var. circulare (Reinsch) Krieger ?, 
cell body  μm long,  μm wide, L/W=, isthmus  μm wide, 
x 640, No.1, Water reservoir, near Teruoka pasture, Nabekura highland, Iiyama city, Nagano Pref., October 19, 2008, by Y. Tsukii
 31 μm
 63 μm
 94 μm; x 640
Images of collecting locality: 
Water reservoir, near Teruoka pasture, Nabekura highland, Iiyama city, Nagano Pref., October 19, 2008, by Y. Tsukii
Cosmarium lundellii Delponte var. circulare (Reinsch) Krieger:  
(Illustrations of the Japanese Fresh-water Algae, 1977)
Cosmarium lundellii Delponte var. corruptum (Turner) W. et G.S. West:  
(Illustrations of the Japanese Fresh-water Algae, 1977)
Cosmarium lundellii Delponte var. pachydermum Hinode:  
(Illustrations of the Japanese Fresh-water Algae, 1977)
Cosmarium lundellii Delponte var. ellipticum W. West:  
(Illustrations of the Japanese Fresh-water Algae, 1977)
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