Genus: Two chloroplasts with axis and laminae structure; axis short, laminae also short making the chloroplasts star-shaped
Species: Cell body cylindrical, large, 20-87 μm long, 11-35 μm wide (Photomicrographs of the Fresh-water Algae, 1984).
[var. brebissonii]: Cell body cylindridal with both round ends, 30-87 μm long, 14-35 μm wide, L/W=2-4; chloroplasts star-shaped, with a single pyrenoid. (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body cylindrical in shape, width 20-35 μm; L/W=2-4
v. brebissonii 34-55 x 27-29 μm L/W= 1.3-1.9 Watarase Tochigi, 2001	v. brebissonii or C. crassa ? 54 x 28 μm L/W=1.9 Kenashitai Hakkoda mountain Aomori, 2005	v. brebissonii 63 x 28 μm Yokotashiro 4 Katashina Gunma, 2007	v. brebissonii 54 x 27 μm Chigo-ike marsh Shiga highland Nagano, 2008
v. brebissonii 78 x 26 μm Hachiman-numa m. Hachimantai Iwate, 2006	v. brebissonii 59 x 26 μm Kuroyachi m.2 Hachimantai Iwate, 2007
v. brebissonii 44,52 x 25 μm Watasuge marsh Tsugaike highland Nagano, 2005	v. brebissonii 73 x 25 μm L/W= 2.9 Kodanuki marsh Fujinomiya Shizuoka, 2005	v. brebissonii 42-70 x 23-24 μm L/W= Shijuhachi-ike Shiga highland Nagano, 2006.6	v. brebissonii 44.5 x 25 μm L/W= Shijuhachi-ike Shiga highland Nagano, 2006.10
v. brebissonii 63 x 24 μm Ohyachi 2 Kazuno Akita, 2007	v. brebissonii 55, 67 x 23 μm Komado marsh 6 Showa & Tajima Fukushima, 2007	v. brebissonii 35 x 23 μm near Meigetsuso Azuma mt. Yamagata, 2007	v. brebissonii 52 x 24 μm L/W= 2.2 Japan, 199?
v. brebissonii 68 x 21 μm Komado marsh 13 Showa & Tajima Fukushima, 2007	v. brebissonii 43 x 21 μm 51 x 22 μm Iruma river side Tsurugashima Saitama, 2003	v. brebissonii 50 x 21.5 μm Gozaisho marsh Hachimantai Iwate, 2005	v. brebissonii 40 x 21 μm Hachiman-numa m. Hachimantai Iwate, 2005
v. brebissonii 40-70 x 20 μm Kurome river Asaka Saitama, 2004	v. brebissonii 43-75 x 20 μm Riverside green l. Sawara Chiba, 2004	v. brebissonii 44-66 x 20 μm L/W= 2.2-3.4 Fukasaku-gawa Y. Saitama, 2002	v. brebissonii ? 65 x 21 μm Fujimitashiro Katashina Gunma, 2008
Cell body cylindrical in shape, width 16-20 μm; L/W=2-4
v. brebissonii 37 x 19 μm L/W= 1.9 Fukasaku-gawa Y. Saitama, 2002	v. brebissonii 48 x 19 μm Higashi-sano Hakuba Nagano, 2004	v. brebissonii 38-40 x 19 μm L/W= Tsuchiura Ibaraki, 2003	v. brebissonii 35-58 x 18 μm Kuritsubo Hidaka Saitama, 2002
v. brebissonii 47 x 19 μm Ushijima park Kasukabe Saitama, 2003	v. brebissonii 47 x 19 μm Kurome River Asaka Saitama, 2006.12
v. brebissonii 65 x 17 μm L/W= Koma river Sakado Saitama, 2003	v. brebissonii 52 x 16.5 μm L/W= Kuritsubo Hidaka Saitama, 2004	v. brebissonii 29-35 x 16 μm L/W= Hachiman-numa m.2 Hachimantai Iwate, 2006	v. brebissonii 45-74 x 16-18 μm L/W= Kodanuki marsh Fujinomiya Shizuoka, 2006
Cell body cylindrical in shape, width 14-16 μm; L/W=2-4
v. brebissonii 44-71 x 15,16 μm L/W=2.9-4.4 Ukishima marsh Tsugaike highland Nagano, 2005	v. brebissonii 37 x 16 μm L/W= Tanohara marsh Shiga highland Nagano, 2004	v. brebissonii 45-50 x 15-16 μm 42 x 17 μm L/W=3.0-3.1 Tenbo marsh Tsugaike highland Nagano, 2005	v. brebissonii 32-52 x 15,16 μm L/W=2.5-3.2 Kenashitai Hakkoda mountain Aomori, 2005
C. brebissonii 18-55 x 11-15 μm Ceske Stredohori M. Czech Republic, 2002	v. brebissonii 47 x 15 μm L/W=3.1 Gozaisho marsh Hachimantai Iwate, 2005	v. brebissonii 22-31 x 14.5 μm L/W= Imou bog Toyohashi Aichi, 2004	v. brebissonii 25 x 14.5 μm L/W= Imou bog Toyohashi Aichi, 2006.9
v. brebissonii 22-56 x 15 μm L/W= Onnenai Kushiro marsh Hokkaido, 2005	v. brebissonii 36 x 15 μm Kama-ike Azuma mountain Fukushima, 2006	v. brebissonii 35 x 15 μm near Iroha-numa Zao mountain Yamagata, 2006	v. brebissonii 30-50 x 15 μm Yahei-daira 2 Azuma mt. Yamagata, 2007
v. brebissonii 42 x 16 μm Yamamuro m.3 Maibara Shiga, 2008	v. brebissonii 32 x 14 μm Shijuhachi-ike 4 Shiga highland Nagano, 2006

Similar genus -->> Zygnema; Penium; Mesotaenium;

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