Species: Cell body 180-(210-493)-540 μm long, (24-45)-52 μm wide (cf. C. intermedium < 25 μm), L/W = 8-12, slightly curved, tapered at both ends, not swelled in the middle (cf. C. rostratum), both ends broadly truncated with slanting edges; cell wall brown in color and striated, 5-10 striae in 10 μm; chloroplasts with with 5-9 pyrenoids in each semicells (Illustrations of the japanese fresh-water algae, 1977).
Both ends are obliquely truncate-convex; striae about 20 across the cell; chloroplasts with 5-6 pyrenoids in each semicells; 210-490 μm long, 24-45 μm wide (Phtomicrographs of the fresh-water algae, 1984).

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C. striolatum 474 x 51 μm 490 x 51 μm L/W=9.3,9.6 Onnenai Kushiro marsh Hokkaido, 2005	C. striolatum 460 x 54 μm L/W=8.5 Onnenai Kushiro marsh Hokkaido, 2005	C. striolatum 494 x 37 μm L/W=13.4 Onnenai Kushiro marsh Hokkaido, 2005	C. striolatum 270 x 30 μm L/W=8.6 standing water Nishiwaga Iwate, 2007.7
C. striolatum 340 x 35 μm 350 x 33 μm L/W=10,10.6 Iroha-numa Zao mountain Yamagata, 2005	C. striolatum 300 x 32 μm L/W=9.4 Iroha-numa Zao mountain Yamagata, 2006	C. striolatum 260 x 33 μm L/W=7.9 Iroha-numa Zao mountain Yamagata, 2005	C. striolatum 362 x 35 μm L/W=10.3 Iroha-numa Zao mountain Yamagata, 2008
C. striolatum 310 x 33 μm L/W= Kejo-numa Furukawa Miyagi, 2003	C. striolatum or C. rostratum ? 305 x 28 μm L/W=11 Komado marsh Showa and Tajima Fukushima, 2004	C. striolatum 486 x 52 μm L/W=9.3 Komado marsh Showa and Tajima Fukushima, 2007	C. striolatum μm L/W= Miyatoko m.1 Minami-Aizu Fukushima, 2008
C. striolatum 255 x 30 μm L/W=8.5 Ikei-no-ike Nasu Tochigi, 2006	C. striolatum 436 x 36 μm L/W=12.1 Chojabaru Kokonoe Oita, 2008	C. striolatum 356 x 36 μm L/W=9.9 Ryugahara m.1 Yuri-Honjo Akita, 2008	C. striolatum or C. rostratum ? 235 x 25 μm L/W=9.5 ends truncated Nasu Tochigi, 2000
C. striolatum 295 x 36 μm L/W= Miyatoko marsh Minami-Aizu Fukushima, 2008	C. striolatum μm L/W= Numappara marsh 3 Nasu-shiobara Tochigi, 2007	C. striolatum 350 x 35 μm L/W=10.0 Numa-no-hara m. Madarao highland Niigata, 2006	C. striolatum ? 400 x 34 μm L/W=11.8 Furuike marsh Togakushi highland Nagano, 2005
C. striolatum ? μm L/W= Iyari marsh 1 Omachi Nagano, 2008	C. striolatum ? μm L/W= Iyari marsh 2 Omachi Nagano, 2008	C. striolatum ? x 34 μm L/W= Iyari marsh 1 Omachi Nagano, 2008
C. striolatum 334 x 39 μm L/W=8.6 Ikenokochi m.5 Tsuruga Fukui, 2006	C. striolatum ? cellwall smooth ? 198 x 18 μm L/W=11 Kenashitai Hakkoda mountain Aomori, 2005

Similar species --->> C. intermedium (φ < 25 μm); C. rostratum;

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