Species [ var. turgidus ]: Unicells or colonies of 2, 4, 8 cells; cells bright blue-green, sometimes coarsely granulated, 8-32 μm in diam. (without sheath), sheaths 2-6 μm in thickness (Photomicrographs of the Freshwater Algae, vol. 3, 1985).
Colony of 2-4 cells, covered with layered gelatinous sheath; cell body 8-32 μm in diam. (excluding sheath), 13-40 μm in diam. (including sheath).
[ var. maximus ]: Cell body 22-45 μm in diam. (excluding sheath, 5-10 μm in thickness)
[ var. thermalis]: Sheath present, but not layered (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. maximus: Cell body 22-45 μm (excluding seath); all cells larger than 20 μm
C. turgidus v. maximus 31 x 35 μm Mida-ga-hara Gassan (mt.) Yamagata, 2005	C. turgidus v. maximus 31 x 22-49 μm Mida-ga-hara 5 Gassan (mt.) Yamagata, 2006	C. turgidus v. maximus 24-28 x 36-37 μm Mida-ga-hara 10 Gassan (mt.) Yamagata, 2006	C. turgidus v. maximus ? 30 x 23 μm J. Skunk Cabbage m. Tsugaike highland Nagano, 2006
C. turgidus v. maximus ? 21 x 24 μm Tanohara marsh Shiga highland Nagano, 2006	C. turgidus v. maximus ? 25 x 34 μm Iroha-numa Azuma mt. Yamagata, 2007
var. turgidus: Cell body 8-32 μm (excluding sheath); containing cells smaller than 20 μm
C. turgidus v. turgidus ? 32 x 25 μm Yumi-ike Shirane mountain Gunma, 2005	C. turgidus v. turgidus ? 30 x 20 μm Hikage marsh Shiga highland Nagano, 2005	C. turgidus v. turgidus 28 x 19 μm Ushidome-ike Norikura highland Nagano, 2005	C. turgidus v. turgidus ? 27 μm Tanohara marsh Shiga highland Nagano, 2004
C. turgidus v. turgidus 27 x 22 μm Sukawa highland Kurikoma mountain Akita, 2005	C. turgidus v. turgidus 17 x 23 μm Sukawa highland Kurikoma mountain Akita, 2007	C. turgidus v. turgidus ? 21 x 29 μm Oh-numa m. Hachimantai Akita, 2007	C. turgidus v. turgidus ? 28 x 21 μm Miyatoko m.3 Minami-Aizu Fukushima, 2008
C. turgidus v. turgidus ? 27 x 17 μm Kenashitai Hakkoda mountain Aomori, 2005	C. turgidus v. turgidus ? 26 x 18 μm Tanohara marsh Shiga highland Nagano, 2005
C. turgidus v. turgidus ? 25 x 20 μm Ukishima marsh Tsugaike highland Nagano, 2005	C. turgidus v. turgidus ? 25 x 35 μm Kawaguchi Natural p. Kawaguchi Saitama, 2005	C. turgidus v. turgidus ? 23 x 14 μm Watasuge marsh Tsugaike highland Nagano, 2005	C. turgidus v. turgidus 22 μm Shimo-no-koike Shiga highland Nagano, 2004
C. turgidus v. turgidus 22 μm Japan, 1998	C. turgidus v. turgidus 22 x 15 μm Hachiman-numa m. Hachimantai Iwate, 2005	C. turgidus v. turgidus 19 x 12,15 μm Hakama marsh Madarao highland Niigata, 2005	C. turgidus v. turgidus 17 x 12 μm Shibu-ike Shiga highland Nagano, 2005
C. turgidus v. turgidus 18 x 15 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	C. turgidus v. turgidus 15 x 23 μm Shijuhachi-ike Shiga highland Nagano, 2006	C. turgidus v. turgidus 15 x 12 μm 12 x 9 μm Tanohara Natural p. Ontake highland Nagano, 2005	C. turgidus v. turgidus 16 x 11 μm Kenashitai Hakkoda mountain Aomori, 2005
C. turgidus v. turgidus 12 x 9 μm Showa Memorial Park Tokyo, 2001	C. turgidus v. turgidus 10-11 x 7-9 μm Kanazawa Ishikawa, 2002
var. thermalis: Seath lacking definite layers
C. turgidus v. thermalis 22 μm Imou bog Toyohashi Aichi, 2004	C. turgidus v. thermalis 24 μm near Imou marsh Toyohashi Aichi, 2004	C. turgidus v. thermalis 21 x 14 μm Univ. A.V.M. Obihiro Hokkaido, 2005	C. turgidus v. thermalis 19 x 15 μm Nagoriga-hara Kurikoma mountain Iwate, 2005
C. turgidus v. thermalis 18 x 11 μm near Nan-ko Shirakawa Fukushima, 2003	C. turgidus v. thermalis 13 x 9 μm Ushijima park Kasukabe Saitama, 2003	C. turgidus ? v. thermalis μm Bessho-numa Saitama, 2001	C. turgidus ? v. thermalis μm Tsuchiura Ibaraki, 2002
C. turgidus ? v. thermalis 9-10 x 8 μm Univ. A.V.M. Obihiro Hokkaido, 2005	C. turgidus v. thermalis 14 x 8 μm Izumi 741 Namegawa Saitama, 2004

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