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. pseudodianae : More slender; 135-300 x 12-22 μm; L/W=16-23; pyrenoids/chl.
v. pseudodianae ? or C. ralfsii 450,460 x 31 μm L/W=14.5,14.8 Onnenai Kushiro marsh Hokkaido, 2005	v. pseudodianae ? or C. ralfsii 350 x 23 μm L/W=15.2 Kashibaru m.5 Karatsu Saga, 2006	v. pseudodianae ? or C. ralfsii 275 x 19 μm L/W=14.5 Shimizu-daira Nasu Tochigi, 2005
v. pseudodianae 245 x 17 μm L/W=14.5 water reservoir near Yamaguchi Univ. Yamaguchi, 2004	v. pseudodianae 225 x 16 μm L/W=14.1 Koigakubo marsh Tessei-cho Okayama, 2004	v. pseudodianae ? 150 x 11 μm L/W=13.6 Numa-no-hara m. Madarao highland Niigata, 2005	v. pseudodianae ? 203 x 15 μm L/W=13.5 Midori-no-ike Togakushi highland Nagano, 2005
v. pseudodianae 240 x 15 μm L/W=16.0 Hasu-ike Shiga highland Nagano, 2005	v. pseudodianae 292 x 15 μm 160 x 13 μm L/W=12.3, 19.5 Ichinose-enchi Norikura highland Nagano, 2005	v. dianae or v. pseudodianae ? 190 x 10.5 μm L/W=18.1 Kumakubo Nasu-shiobara Tochigi, 2005
v. pseudodianae ? 144-155 x 11.5 μm L/W=12,13.5 Iroha-numa Zao mountain Yamagata, 2006	v. pseudodianae ? 150 x 10 μm L/W=15 Kashibaru marsh 6 Karatsu Saga, 2006

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

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