Species: Cell body slender, straight at the center, slightly tapered and curved toward ends, 90-(155-272)-275 μm long, (4-7)-8 μm wide (cf. C. macilentum, > 260 μm long, > 11 μm wide), L/W = 25-40; cell wall smooth, colorless (Illustrations of the Japanese Fresh-Water Algae, 1977).

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Cell body centrally straight; both ends rounded (pores present ?)
C. gracile 320 x 8.5 μm L/W=37.6 Ko-numa Tsukiyono Gunma, 2007	C. gracile 278 x 8.8 μm L/W=31.6 Kaga Ishikawa, 2000	C. gracile 235 x 6.5 μm L/W=36.2 Ichinose-enchi Norikura highland Nagano, 2005	C. gracile 190 x 6 μm L/W=31.7 Ichinose-enchi Norikura highland Nagano, 2006
C. gracile 230 x 6.5 μm L/W=35.4 Kodanuki marsh Fujinomiya Shizuoka, 2006	C. gracile 230 x 6 μm L/W=38.3 Azami-ike Norikura highland Nagano, 2006	C. gracile 228, 268 x 6 μm L/W=38, 44.7 Koigakubo marsh Tessei-cho Okayama, 2004	C. gracile 226 x 6 μm L/W=37.7 Kashibaru m.1 Saga Shizuoka, 2006
C. gracile 235 x 9 μm L/W=26.1 Ochiai-numa1 Noshiro Akita, 2007	C. gracile 198 x 5 μm L/W=39.6 Komado marsh Showa & Tajima Fukushima, 2004	C. gracile 196, 240 x 6 μm L/W=33, 40 Komado marsh Showa & Tajima Fukushima, 2004	C. gracile 214,243 x 6.5 μm Komado marsh 5 Showa & Tajima Fukushima, 2007
C. gracile 190-240 x 6 μm L/W=29-40 Numa-no-hara marsh Madarao highland Niigata, 2005	C. gracile 215 x 7 μm L/W=30.7 Yoshigadaira m. Shirane mountain Gunma, 2005	C. gracile 195 x 6 μm L/W=32.5 Numappara marsh Kuroiso Tochigi, 2003	C. gracile 187 x 6.5 μm L/W=28.8 Kumakubo Nasu-shiobara Tochigi, 2005
C. gracile 210 x 6 μm L/W=35.0 Numappara marsh Nasu-shiobara Tochigi, 2007	C. gracile 155 x 6 μm L/W=25.8 Ichinose-enchi Norikura highland Nagano, 2005	C. gracile 150 x 5 μm L/W=30.0 Oze s.k.m. Oze-ga-hara Gunma, 2006	C. gracile 206 x 7 μm L/W=29.4 Yamakado marsh Nishi-Asai Shiga, 2008
C. gracile 64-80 x 3-4.5 μm L/W=17-21 Koigakubo marsh Tessei-cho Okayama, 2004	C. gracile 110 x 4.5 μm L/W=25.8 Omotsubo marsh Tetta-cho Okayama, 2004	C. gracile 105 x 4 μm L/W=26.3 Koigakubo marsh Tessei-cho Okayama, 2004	C. gracile ? 180 x 7 μm L/W=25.7 Uruguay, 1999
Cell body tapered toward both ends
C. gracile ? or C. idiosporum ? 255 x 5.5 μm L/W=46.4 Shirahata-Numa Urawa Saitama, 2005	C. gracile ? 204 x 9 μm L/W=22.7 Lake Tanuki Fujinomiya Shizuoka, 2006	C. gracile ? 198 x 5 μm L/W=39.6 Uruguay, 1999	C. gracile ? 175 x 5 μm L/W=35 Tsukuba Ibaraki, 2003
C. gracile ? or C. acutum ? 183 x 5 μm L/W=44 water reservoir near Yamaguchi Univ. Yamaguchi, 2004	C. gracile ? or C. acutum ? 181 x 5 μm L/W=36 Saitama, 1999	C. gracile ? or C. acutum ? 175-225 x 6.3 μm L/W=27-35.8 Japan, 1997	C. gracile ? or C. acutum ? 140 x 4.5 μm L/W=31 Takezono-higashi p. Tsukuba Ibaraki, 2003
C. gracile or C. limneticum ? 196 x 8 μm L/W=24.5 Doman G.P. Nishi-Urawa Saitama, 2001	C. gracile or C. limneticum ? 160 x 6.5 μm L/W=24.6 near Town Hall Shobu Saitama, 2004	C. gracile or C. limneticum ? 177 x 7 μm L/W=25.3 Onnenai Kushiro marsh Hokkaido, 2005
C. gracile ? or C. idiosporum ? 175 x 4 μm L/W=44 near Yamaguchi Univ. Yamaguchi, 2004	C. gracile ? or C. pronum ? 202 x 4 μm L/W=50.5 Kashibaru m.3 Karatsu Saga, 2006	C. gracile ?? or C. pronum ? 440 x 12 μm L/W=36.7 Uruguay, 1999

Similar species -->> C. macilentum; C. aciculare; C. idiosporum; C. pronum;

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