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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4) Cell body moderately curved; inner side concaved; L/W=5-6
var. moniliferum 337 x 60 μm L/W=5.6 Japan, 1998	var. moniliferum 305 x 52 μm L/W=5.9 Shiken-zaike Kamikawa Saitama, 2004	var. moniliferum 290 x 53 μm L/W=5.5 standing water Hatoyama Saitama, 2004	var. moniliferum 290 x 51 μm L/W=5.7 Numa-no-hara m Madarao highland Niigata, 2006
var. moniliferum 285 x 50 μm L/W=5.7 standing water Hatoyama Saitama, 2004	var. moniliferum 265 x 47 μm L/W=5.6 Urawa Saitama, 2001	var. moniliferum 259 x 45 μm L/W=5.8 Maruyama Park Saitama, 2002	var. moniliferum 235 x 42 μm L/W=5.6 Yamaguchi Univ. Yamaguchi, 2004
var. moniliferum 207 x 37 μm L/W=5.6 Toneri Park Tokyo, 2001	var. moniliferum 200 x 35 μm 202 x 30 μm 205 x 30 μm 190 x 30 μm L/W=5.7 Urawa Saitama, 2001	var. moniliferum 260 x 50 μm L/W=5.2 Midori-no-ike Togakushi highland Nagano, 2005

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

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