Species [ var. botrytis ]: Cell body (56-59)-65-95 μm long, (50-54)-68 μm wide, isthmus (14-18)-24 μm wide; semicells pyramidal in shape, basal corner broadly rounded, apex flattened or slightly convex, side and apical view elliptical; cell wall covered with uniformly arranged granules.
[var. subtumidum ]: Cell body broader than var. botrytis, 52-80 μm long, 43-65 μm wide, isthmus 10-15 μm wide; granules at the center of semicells larger than others (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. botrytis var. subtumidum 77 x 59 μm 75 x 57 μm 72 x 51 μm Yamaguchi Univ. Yamaguchi, 2004	C. botrytis var. subtumidum 74 x 58 μm Shiken-zaike Kamikawa Saitama, 2004	C. botrytis var. subtumidum 71 x 55 μm Senuki Nasu Tochigi, 2004	C. botrytis var. subtumidum 70 x 60 μm Nagaike park Hachioji Tokyo, 2005
C. botrytis var. subtumidum 70 x 52 μm 66 x 45 μm Ishinazaka Furukawa Miyagi, 2003	C. botrytis var. subtumidum 70 x 50 μm Kotoku-numa Nikko Tochigi, 2006	C. botrytis var. subtumidum 67 x 54 μm riverside park Kuroiso Tochigi, 2005	C. botrytis var. subtumidum 59-67 x μm rice field Ichinoseki Iwate, 2005
C. botrytis var. subtumidum 65 x 54 μm near Hanekura bridge Shiki Saitama, 2004	C. botrytis var. subtumidum 65 x 54 μm Norin Park Kawamoto Saitama, 2004	C. botrytis var. subtumidum 64 x 53 μm Imou bog Toyohashi Aichi, 2004	C. botrytis var. subtumidum 62 x 56 μm Kasuga Fukuoka, 2001
C. botrytis var. subtumidum 60 x 55 μm Muneoka Shiki Saitama, 2004	C. botrytis var. subtumidum 59 x 45 μm 58 x 53 μm 62 x 56 μm 60 x 54 μm Saitama, 1999	C. botrytis var. subtumidum μm near Oyomi m. Hakuba Nagano, 2008
C. botrytis var. subtumidum 60 x 52 μm Motono Chiba, 2003	C. botrytis var. subtumidum 59 x 51 μm Nishi-Urawa Saitama, 2001	C. botrytis var. subtumidum 57 x 50 μm Iida-shinden Nishi-ku Saitama, 2004	C. botrytis var. subtumidum 55 x 50 μm Zaike Sakura-ku Saitama, 2004
C. botrytis var. subtumidum 53 x μm Kuroiso Park Tochigi, 2003	C. botrytis 55 x 52 μm 68 x 54 μm near Takao-sakura p. Kitamoto Saitama, 2005	C. botrytis var. subtumidum 55 x 50 μm Koume-kotohira p. Kiryu Gunma, 2006
C. botrytis or C. vexatum ? 60 x 48 μm Shiken-zaike Kamikawa Saitama, 2004	C. botrytis or C. vexatum ? 53 x 43 μm Saitama, 1999	C. botrytis or C. vexatum ? 56 x 45 μm riverside Abukuma river Fukushima, 2005

Similar species -- >> C. sportella; C. vexatum;

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