Species [ var. dianae ]: Cell body slightly curved, tapered toward both ends, truncated with slanted edges, small pores present at outside of both termini, inner side at center slightly convex, 150-380 μm long, 15-40 μm wide, L/W = 10-12; cell wall smooth; chloroplasts with 5-8 pyrenoids in each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell body 160-323 μm long, 20-28 μm wide, L/W=8.3-12; chloroplasts with about 6 laminae; semicells with 4-8 pyrenoids (Photomicrographs of the Freshwater Algae, vol. 6, 1987).

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var. dianae : 150-380 x 15-40 μm; L/W=10-12; sighlty swelled at the center; 5-8 pyrenoids/chl.
v. dianae 145-260 x μm L/W=10-16? Numa-no-hara m. Madarao highland Niigata, 2005	v. dianae 235 x 19 μm 205 x 18 μm L/W=12.3, 11.4 Imori pond Myoko highland Niigata, 2004	v. dianae 255 x μm L/W=10.6 Maimeno-ike Norikura highland Nagano, 2006	v. dianae 210 x 17 μm L/W=12.4 Dojo-ike Norikura highland Nagano, 2007
v. dianae 225 x 19 μm L/W=11.8 Kowashimizu Suwa Nagano, 2005	v. dianae 195 x 19 μm L/W=10.3 Kowashimizu Suwa Nagano, 2007
v. dianae 235 x 24 μm L/W=9.8 Kabuto-yama Nishi-no-miya Hyogo, 2004	v. dianae 230 x 18 μm L/W=12.8 Ikenokochi m.1 Tsuruga Fukui, 2006	v. dianae 225 x 17 μm 110 x 9 μm L/W=13.2, 12.2 Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	v. dianae 200 x 18 μm L/W=11.1 Yoshigadaira m. Shirane mountain Gunma, 2005
v. dianae 155-210 x μm L/W=13-16 mear Karakemi m. Omachi Nagano, 2005	v. dianae 205 x 16 μm L/W=12.8 Kakuman-buchi Akagi mountain Gunma, 2005	v. dianae 220 x 15 μm L/W=14.7 Kakuman-buchi Akagi mountain Gunma, 2007
v. dianae 180 x 17 μm L/W=10.6 Ohnuma Nasu-shiobara Tochigi, 2006	v. dianae 190 x 18 μm L/W=10.6 Koigakubo marsh Tessei-cho Okayama, 2004
v. dianae 202 x 16.5 μm L/W=12.2 Ichinose-enchi Norikura highland Nagano, 2005	v. dianae 210 x 15.5 μm L/W=13.5 Ichinose-enchi Norikura highland Nagano, 2006	v. dianae 215 x 15 μm L/W=14.3 Azami-ike Norikura highland Nagano, 2006	v. dianae 162 x 16 μm L/W=10.1 Omine mountain Minakami Gunma, 2006
v. dianae 235 x 18 μm L/W=13.1 Yoshigadaira m. Shirane mountain Nagano, 2005	v. dianae 230 x 17 μm L/W=13.5 Tashirodaira m. Hakkoda mountain Aomori, 2005	v. dianae 215 x 16 μm L/W=13.4 Tashirodaira m. Hakkoda mountain Aomori, 2006	v. dianae 163 x 14.5 μm L/W=11.2 Suiren-numa Hakkoda mountain Aomori, 2005

Similar species -->> C. venus ( < 85 μm ); C. calosporum; C. parvulum; C. leibleinii; C. moniliferum;

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