Species [var. moniliferum]: 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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3) Cell body moderately curved; inner side concaved; L/W = 6-7; body < 300 μm
var. moniliferum 290 x 46 μm 270 x 47 μm L/W=6.3, 5.7 Yamaguchi Univ. Yamaguchi, 2004	var. moniliferum 290 x 43 μm L/W=6.3 near Karasu river Fujioka Gunma, 2004	var. moniliferum 250-288 x 35-48 μm L/W=6.0-7.1 Japan, 1998	var. moniliferum 280 x 44 μm L/W=6.4 Sanda Hyogo, 2001
var. moniliferum 280 x 47 μm L/W=6.0 Midori-no-ike Togakushi highland Nagano, 2005	var. moniliferum 250 x 42 μm L/W=6.0 Togakushi highland Nagano, 2006	var. moniliferum 280 x 45 μm L/W=6.2 Satsunai river Obihiro Hokkaido, 2005	var. moniliferum 268 x 40 μm L/W=6.7 Kitamoto Saitama, 2001
var. moniliferum 265 x 42 μm L/W=6.3 Hazama marsh Ashikaga Tochigi, 2003	var. moniliferum 260-280 x 40-42 μm L/W=6.5-6.7 Hazama marsh Ashikaga Tochigi, 2006	var. moniliferum 270 x 40 μm L/W=6.8 Kejo-numa Furukawa Miyagi, 2003	var. moniliferum 265 x 38 μm L/W=7.0 drainage ditch Urawa Saitama, 2005
var. moniliferum 250 x 37 μm L/W=6.8 Japan, 1998	var. moniliferum 250 x 40 μm L/W=6.3 Niigata, 2001	var. moniliferum 250 x 40 μm L/W=6.3 Tachikawa Tokyo, 2001	var. moniliferum 250 x 40 μm L/W=6.3 rice field Ichinoseki Iwate, 2005
var. moniliferum 250 x 37 μm L/W=6.8 Konpira bridge Shirakawa Fukushima, 2003	var. moniliferum 234 x 38 μm L/W=6.2 Japan, 1999	var. moniliferum 235 x 35 μm L/W=6.7 Tochigi, 2001	var. moniliferum 220 x 37 μm cell division Saitama, 2000
var. moniliferum 208 x 33 μm L/W=6.3 Uruguay, 1999	var. moniliferum ? μm L/W=6 Japan, 199?	var. moniliferum 215 x 33 μm L/W=6.5 Kejo-numa Furukawa Miyagi, 2003	var. moniliferum 212 x 34 μm L/W=6.2 near City Hall Fujimi Saitama, 2004

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

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