Species: Cell body elongated spindle-shaped, 220-(240-312) μm long, (10-11)-14 μm wide, L/W=20-26 (cf. C. strigosum,150-410 μ L/W=10-18); cell wall transparent, smooth; chloroplasts with 3-6 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell body (110-)150-250(-310) μm long, (6-)8-12(-14) μm wide; L/W=(12-)15-30(-35) (Coesel & Meesters 2007).

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L/W around 20-30
C. idiosporum 278 x 8 μm L/W=34.8 Ohyachi 2 Kazuno Akita, 2007	C. idiosporum ? 293 x 11.5 μm L/W=25.5 Ohyachi 1 Kazuno Akita, 2007	C. idiosporum 270,328 x 10 μm L/W=26,33 Gozaisho marsh Hachimantai Iwate, 2005
C. idiosporum 247 x 7.5 μm L/W=32.9 Sensho-ga-hara 4 Shizukuishi Iwate, 2007	C. idiosporum 140 x 5 μm L/W=28 Tojuro Azuma mt. Yamagata, 2007	C. idiosporum ? 202-240 x μm L/W=27-31 Sukawa highland Kurikoma mountain Akita, 2005
C. idiosporum 224 x 7 μm L/W=32 Tashirodaira m.6 Hakkoda mountain Aomori, 2006	C. idiosporum 230 x 7 μm L/W=33 Shibakusadaira Zao mountain Miyagi, 2007	C. idiosporum 185 μm L/W=33.6 Kejo-numa Furukawa Miyagi, 2003	C. idiosporum 123 x 4 μm L/W=30.8 Iroha-numa Zao mountain Yamagata, 2005
C. idiosporum 190, 230 x 7 μm L/W=27, 33 Komado marsh Showa and Tajima Fukushima, 2004	C. idiosporum 202 x 9, 295 x 8 L/W=22, 32 Numa-no-hara marsh Madarao highland Niigata, 2005	C. idiosporum 200 x 5.5 μm L/W=26-32 Tokyo, 2001	C. idiosporum 225 x 6.5 μm L/W=34.6 Fujimitashiro Katashina Gunma, 2007
C. idiosporum 115-223 x 4-7 μm L/W=29-32 Watasuge marsh Tsugaike highland Nagano, 2006	C. idiosporum 120-122 x 3-4 μm L/W=27,31 Ukishima marsh Tsugaike highland Nagano, 2005	C. idiosporum 218 x 6.5 μm L/W=33.5 near Okubo ike Shinano Nagano, 2004	C. idiosporum 173 x 4.5 μm L/W=28.7 Ichinose-enchi Norikura highland Nagano, 2005
C. idiosporum 240 x 8 μm L/W=30 Chigo-ike Shiga highland Nagano, 2006	C. idiosporum 205 x 7 μm L/W=29.3 Kuroyachi m.2 Hachimantai Iwate, 2007	C. idiosporum 278,213 x μm or C. gracile ? L/W=35,43 Kejo-numa Osaki Miyagi, 2006
L/W nearly 20 (intermediate ?)
C. idiosporum or C. strigosum ? 195 x 8.5 μm L/W=22.9 Imori pond Myoko highland Niigata, 2004	C. idiosporum or C. strigosum ? 142 x 6.5 μm L/W=21.8 rice field Omiya-showa Saitama, 2005	C. idiosporum or C. strigosum ? 115, 117 x 4.5 μm L/W=25.6-26 Tanohara marsh Shiga highland Nagano, 2004	C. idiosporum or C. strigosum ? 131 x 3 μm 165 x 6 μm L/W=21.8, 27.5 near Yamaguchi Univ. Yamaguchi, 2004
C. idiosporum 210 x 12.5 μm L/W= Azami-ike Norikura highland Nagano, 2006

Similar species -->> C. pronum ( μ, L/W=30-45); C. acutum ( μ, L/W= 20-30); C. strigosum (150-410 μ, L/W=10-18); C. aciculare (390-800 μ, L/W=73-135); C. gracile (90-275 μ, L/W=25-40);

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