Species [var. intermedium]: Cell body slightly curved, central region not swelled (inner side slightly concave), both ends broadly truncated with slanted edges, 76-(200-300)-470 μm long, 14-(17-22)-25 μm wide (cf. C. striolatum > 25 μm), L/W=6-15; cell wall brownish in color, with bands and lined (6-10 lines within 10 μm)
[var. hibernicum]: Cell body straight at central region, 200-(350)-384 μm long, 14-(26) μm wide, L/W=; (Illustrations of The Japanese Fresh-water Algae, 1977).

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Var. intermedium: Cell body slightly curved
v. intermedium 406 x 37 μm L/W=11.0 Oh-Yachi 5 Komado marsh Fukushima, 2007	v. intermedium 250 x 25 μm L/W=10.0 Miyatoko m.3 Minami-Aizu Fukushima, 2008	v. intermedium 414 x 33 μm L/W=12.5 Igashira park Mooka Tochigi, 2006	v. intermedium 340 x 29 μm L/W=11.7 Ikei-no-ike Nasu Tochigi, 2006
v. intermedium 305 x 26 μm L/W=11.7 Kareki-numa m. Nikko Tochigi, 2008	v. intermedium 260 x 22 μm L/W=11.8 Omine-numa Tsukiyono Gunma, 2003	v. intermedium 260,275 x 23 μm L/W=11.8 Omine-numa Tsukiyono Gunma, 2006	v. intermedium 255,310 x 19,22 μm L/W=13.4,14.1 Omine-numa 6 Tsukiyono Gunma, 2007
v. intermedium 300,305 x 24,22 μm L/W=12.5-14 near Omine-numa Tsukiyono Gunma, 2006	v. intermedium 250 x 23 μm L/W=10.9 Michi-no-eki Tsukiyono Gunma, 2003	v. intermedium ? μm L/W= Yokotashiro 3 Katashina Gunma, 2007	v. intermedium ? 220 x 25 μm L/W=8.8 Kashibaru m. Karatsu Saga, 2008
v. intermedium 450 x 34 μm L/W=13.2 Ichinose-enchi Norikura highland Nagano, 2005	v. intermedium 280 x 23 μm L/W=12.2 Ichinose-enchi Norikura highland Nagano, 2006	v. intermedium 330 x 24 μm L/W= Ichinose-enchi Norikura highland Nagano, 2006	v. intermedium 296 x 23 μm L/W=12.9 Maimeno-ike Norikura highland Nagano, 2006
v. intermedium 255 x 24 μm L/W=10.6 near Oyomi marsh Hakuba Nagano, 2004	v. intermedium 364 x 33 μm L/W=11.0 Oyomi marsh Hakuba Nagano, 2006	v. intermedium 270 x 21 μm L/W=12.9 Hasu-ike Shiga highland Nagano, 2005	v. intermedium 286 x 25 μm L/W=11.4 Nozomiko 2 Iiyama Nagano, 2007
v. intermedium 430 x 34 μm L/W= Okahotto-Yatsu Abiko Chiba, 2008	v. intermedium μm L/W= near Dojo-ike Norikura highland Nagano, 2007	v. intermedium or C. striolatum ? 290 x 27 μm L/W=10.7 Dojo-ike Norikura highland Nagano, 2007
v. intermedium 265 x 24 μm L/W=11.0 Kodanuki marsh Fujinomiya Shizuoka, 2005	v. intermedium ? 280 x 20 μm L/W=14.0 Kodanuki marsh Fujinomiya Shizuoka, 2005	v. intermedium ? x 22 μm L/W= Kodanuki marsh Fujinomiya Shizuoka, 2006
Var. hibernicum: Cell body straight at central region
v. hibernicum ? 275 x 25 μm L/W= Kejo-numa Furukawa Miyagi, 2004	v. hibernicum 382 x 35 μm L/W=10.9 Iroha-numa Zao mountain Yamagata, 2006	v. hibernicum μm L/W= near Aspite Line Hachimantai Akita, 2007
v. hibernicum 360 x 31 μm L/W=11.6 Jodo-daira Azuma mountain Fukushima, 2006	v. hibernicum 363 x 24 μm 400 x 32 μm L/W=12.5, 15.1 near Akai wetland Aizuwakamatsu Fukushima, 2005
v. hibernicum ? 380 x 29 μm 372 x 31 μm L/W=12.0,13.1 Yoshigadaira m. Shirane mountain Gunma, 2005	v. hibernicum 360 x 25 μm L/W=14.4 near Omine Mt. Minakami Gunma, 2007	v. hibernicum 412 x 33 μm L/W=12.5 near R272 Minakami Gunma, 2008	v. hibernicum μm L/W= Motoyu marsh Nikko Tochigi, 2008
v. hibernicum ? 440 x 36 μm L/W=12.2 Numappara marsh Kuroiso Tochigi, 2003	C. intermedium ? or C. juncidum ? 175 x 11 μm L/W= Numappara marsh Kuroiso Tochigi, 2003	v. hibernicum ? 410 x 30 μm L/W=13.7 Hazama marsh Ashikaga Tochigi, 2003	v. hibernicum ? 420 x 30 μm L/W=14.0 Hazama marsh Ashikaga Tochigi, 2006
v. hibernicum 500 x 41 μm L/W=12.2 Hakama marsh Madarao highland Niigata, 2006	v. hibernicum ? 420, 364 x μm L/W=11-11.7 Numa-no-hara marsh Madarao highland Niigata, 2005	v. hibernicum 360 x 25 μm L/W=14.4 Numa-no-hara m. Madarao highland Niigata, 2005	v. hibernicum 350 x 30 μm L/W=11.7 Numa-no-hara m. Madarao highland Niigata, 2006
v. hibernicum ? 380 x 30 μm 340 x 32 μm L/W=12.7, 10.6 Kowashimizu Suwa Nagano, 2005	v. hibernicum ? 310 x 30 μm L/W=10.3 Kowashimizu Suwa Nagano, 2007	v. hibernicum 214 x 18 μm L/W= Tanohara marsh Shiga highland Nagano, 2004	v. hibernicum 215 x 16 μm L/W=13.4 Tanohara marsh Shiga highland Nagano, 2005
v. hibernicum ? or C. abruptum 245 x 17 μm L/W= Shimo-no-koike Shiga highland Nagano, 2004	v. hibernicum 293 x 18 μm L/W=16.3 Karakemi marsh Yasaka Nagano, 2005	v. hibernicum or C. abruptum ? 266 x 18 μm 275 x 17 μm Karakemi marsh Yasaka Nagano, 2005
v. hibernicum ? 275 x 25 μm L/W=11 Imou marsh Toyohashi Aichi, 2006	v. hibernicum ? 490 x 31 μm L/W=15.8 near Yamaguchi Univ. Yamaguchi, 2004	v. hibernicum 512 x 35 μm L/W=10.9 Kashibaru m.2 Karatsu Saga, 2006	v. hibernicum 350 x 28 μm L/W=12.5 Kasuga Fukuoka, 2001

Similar species -->> C. striolatum (φ > 25 μm); C. rostratum; C. lineatum;

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