Species [var. ralfsii]: Cell body slightly curved, swelled at the center, gradually attenuated (cf. C. kuetzingii, C. setaceum) toward both slanted and narrow ends (cf. C. rostratum), 300-610 μm long, (30-)40-62 μm wide, L/W=6-9; cell wall brownish in color, lined (7-9/10 μm); 6-9 pyrenoids in each semicell.
[var. hybridum]: Cell body slender than var. ralfsii, slightly swelled at the center; 300-770 μm long, 24-40 μm wide, L/W=12-18.
[var. gracilius]: Cell body smaller, narrower than var. ralfsii, 140-242 μm long, 11-25 μm wide.
[var. novae-anguliae]: Cell body longe than var. ralfsii, (631-816)-1080 μm long, (23-26)-30 μm wide, L/W=28-31 (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. ralfsii: L/W=6-9; 300-610 μm long, 30-62 μm wide
v. ralfsii or C. macilentum ? 580 x 47 μm L/W=12 Seseragi marsh Shiga highland Nagano, 2004	v. ralfsii 266 x 32 μm L/W=8.3 Numa-no-hara m. Madarao highland Niigata, 2006	v. ralfsii 240 x 32 μm L/W=7.5 Kowashimizu Suwa Nagano, 2007
var. hybridum: L/W=12-18; 300-700 μm long, 24-40 μm wide
v. hybridum 450 x 36 μm L/W=12.5 Yoshi-numa Nasu-shiobara Tochigi, 2006	v. hybridum 215 x 19 μm L/W=11.3 Igashira park Mooka Tochigi, 2004	v. hybridum or C. macilentum ? 390 x 30 μm L/W=13 USA, 1999	v. hybridum or C. rostratum ? 480-488 x 40-42 μm L/W=12 Koigakubo marsh Tessei-cho Okayama, 2004
v. ralfsii 390 x 31 μm L/W=12.6 Numa-no-hara m.4 Madarao highland Niigata, 2007	v. ralfsii 410 x 33 μm L/W=12.4 Numa-no-hara m.1 Madarao highland Niigata, 2007	v. ralfsii or C. macilentum ? 550 x 46 μm L/W=12.0 Iyari marsh 2 Omachi Nagano, 2008	v. ralfsii μm L/W= Iyari marsh 1 Omachi Nagano, 2008
v. ralfsii μm L/W= Iyari marsh 2 Omachi Nagano, 2008	v. ralfsii μm L/W= Okahotto-Yatsu Abiko Chiba, 2008	v. ralfsii μm L/W= Tonbo-no-numa Isumi Chiba, 2007	v. ralfsii ? 500 x 40 μm 550 x 67 μm Kareki-numa m Nikko Tochigi, 2008
v. ralfsii ? 390 x 33 μm L/W=11.8 Yamakado m. Nishi-Azai Shiga, 2008	v. ralfsii 500 x 35 μm L/W=14.3 Yamamuro m.2 Maibara Shiga, 2008	v. ralfsii 440 x 32 μm L/W=13.8 Yamamuro m.8 Maibara Shiga, 2008	v. ralfsii μm L/W= Hanadate S.W. Yuri-Honjo Akita, 2008
v. hybridum or C. kuetzingii ? 400 x 32 μm L/W=12.5 near Akai wetland Aizuwakamatsu Fukushima, 2005	v. hybridum or C. kuetzingii ? 434 x 35 μm L/W=12.4 near Akai wetland Aizuwakamatsu Fukushima, 2008	v. hybridum or C. kuetzingii ? 470 x 36 μm L/W=13.0 Miyatoko m.1 Minami-Aizu Fukushima, 2008	v. hybridum or C. kuetzingii ? 450 x 35 μm L/W=12.9 Miyatoko m.3 Minami-Aizu Fukushima, 2008
Terminal shape close to C. kuetzingii but L/W close to C. ralfsii v. hybridum
v. hybridum or C. kuetzingii ? 460 x 38 μm L/W=12.1 Igashira park Mooka Tochigi, 2006	v. hybridum or C. kuetzingii ? 400 x 32 μm L/W=12.5 Oyomi marsh Hakuba Nagano, 2006	v. hybridum or C. kuetzingii ? 420 x 32 μm L/W=13.1 Kakuman-buchi Akagi mountain Gunma, 2005
v. hybridum or C. kuetzingii ? 420 x 32 μm 370 x 32 μm L/W=13.1, 11.6 Kowashimizu Suwa Nagano, 2005	v. hybridum or C. kuetzingii ? 390 x 32 μm L/W=12.2 Tochigi, 2000	v. hybridum or C. kuetzingii ? 374 x 33 μm L/W=11.3 Hasu-ike Shiga highland Nagano, 2005	v. hybridum or C. kuetzingii ? 384 x 30 μm L/W=12.8 Ichinose-enchi Norikura highland Nagano, 2005
v. hybridum 360,400 x μm L/W=12 Furuike marsh Togakushi highland Nagano, 2006	v. hybridum 386 x 33 μm L/W=11.7 Kodanuki marsh Fujinomiya Shizuoka, 2006	v. hybridum ? 512 x 31 μm L/W=16.5 Kashibaru m.4 Karatsu Saga, 2006	v. hybridum ? x 28 μm L/W= Kashibaru m.1 Karatsu Saga, 2006
v. hybridum ? 480 x 38 μm L/W=12.6 Kashibaru m Karatsu Saga, 2008
var. novae-anguliae: L/W=28-31; 631-1081 μm long, 23-30 μm wide
v. novae-anguliae or v. hybridum ? 600 x 37 μm L/W=16 Sanda Hyogo, 2001
var. gracilius: Cell body small; 140-242 μm long, 11-25 μm wide
v. gracilius or C. dianae ? 215 x 14 μm L/W=15.4 Omine-numa Tsukiyono Gunma, 2003	v. gracilius or C. rostratum ? 236, 242 x 26 μm L/W=9.1, 9.3 Nasu Tochigi, 2000

Similar species -->> C. rostratum; C. kuetzingii; C. subulatum;

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