Species: Cell body moderately curved, gradually attenuated toward ends, which are broadly rounded, inner margin slightly inflated in the middle, outer margin strongly convex, 204-384 μm long, 36-60 μm wide, L/W=4.6-8; chloroplasts with 4-6 longitudinal ridges and 4-7 pyrenoids in each semicell; cell wall smooth and colorless; zygospores ellipsoid with a smooth wall (Photomicrographs of the Freshwater Algae, vol. 7, 1987). Cell body 170-450 μm long, 28-72 μm wide, L/W=6-8 (Illustrations of The Japanese Fresh-water Algae, 1977).

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2) Cell body moderately curved; inner side concaved; L/W = 6-7; body > 300 μm
var. moniliferum 380 x 54 μm L/W=7.0 Onnenai Kushiro marsh Hokkaido, 2005	var. moniliferum 340-360 x 55 μm L/W=6.5 Numa-no-hara m. Madarao highland Niigata, 2005	var. moniliferum 340 x 50 μm L/W=6.8 Oyomi marsh Hakuba Nagano, 2006	var. moniliferum 337 x 50 μm L/W=6.7 Okubo-cho Tomita Ashikaga, 2003
var. moniliferum 320 x 50 μm L/W=6.4 near Ayu-kawa b. Fujioka Gunma, 2004	var. moniliferum 316 x 47 μm L/W=6.7 Kozai Takamatsu Kagawa, 2002	var. moniliferum ? μm L/W= Watarase Wetland Fujioka Tochigi, 2005	var. moniliferum 304 x 47 μm L/W=6.5 Kejo-numa 2 Osaki Miyagi, 2006
var. moniliferum 305 x 52 μm L/W=6.2 Shiba river near Owada Park Saitama, 2005	var. moniliferum 305 x 50 μm L/W=6.1 Sannoh Park Saitama Saitama, 2005	var. moniliferum 303 x 50 μm 260 x 37 μm L/W=7.0,6.1 near Karakemi m. Omachi Nagano, 2005	var. moniliferum 300 x 50 μm L/W=6.0 Kodai-hasu p. Gyoda Saitama, 2006
var. moniliferum 330 x 50 μm L/W=6.6 Karakemi marsh Omachi Nagano, 2008

Similar species -->> C. dianae; C. leibleinii; C. ehrenbergii;

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