Species [var. ehrenbergii]: Cell body large, swelled at the center (inner-side straight or slightly convex), 230-(384-416)-880 μm long, 44-(64-84)-170 μm wide, L/W=4-6; cell wall smooth, colorless, bands absent; chloroplasts with 4-7 laminae, with many pyrenoids scattered.
[ var. atumidum Grönblad ]: Inner side not convex, (416-508)-560 μm long, (60-69)-72 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
[ var. podolicum Gutwinski ]: Both ends slightly recurved, 382 μm long, 86 μm wide. (Photomicrographs of the Freshwater Algae, vol.9, 1989).
[ var. malinvernianum (De Notaris) Rabenhorst ]: Cell wall lined (10-12 striae/10 μm), brownish in color; 265-520 μm long, 52-75 μm wide, L/W=4-7.
[ var. michailovskoense Elenkin ]: Cell wall dotted (ibid., vol.4, 1985).

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var. ehrenbergii: Cell wall smooth, girdle bands absent
v. ehrenbergii 540-580 x 71-88 μm L/W=6.9-7.6 Onnenai Kushiro marsh Hokkaido, 2005	v. ehrenbergii 560 x 101 μm L/W=5.5 Onnenai Kushiro marsh Hokkaido, 2005	v. ehrenbergii 560 x 101 μm L/W=6.6 drainage ditch Urawa Saitama, 2005	v. ehrenbergii 520 x 102 μm L/W=5.1 Lake Shirakaba Tateshina & Chino Nagano, 2004
v. ehrenbergii 480 x 88 μm L/W=5.5 Suga-daira m. Ueda Nagano, 2006	v. ehrenbergii 520 x 86 μm L/W=6.0 Oyomi marsh Hakuba Nagano, 2004	v. ehrenbergii μm L/W= pond near R272 Minakami Gunma, 2008
v. ehrenbergii 500 x 72 μm L/W=6.9 Okubo-cho Ashikaga Tochigi, 2003	v. ehrenbergii 490 x 64 μm L/W=7.7 Okubo-cho Ashikaga Tochigi, 2003	v. ehrenbergii 480-520 x 90-96 μm L/W=5.3-5.4 Ichinose-enchi Norikura highland Nagano, 2005	v. ehrenbergii x μm L/W= Azami-ike 1 Norikura highland Nagano, 2007
v. ehrenbergii 425 x 78 μm L/W=5.4 Uruguay, 1999 Movies	v. ehrenbergii μm L/W= Sanda Hyogo, 2001	v. ehrenbergii ? 500 x 86 μm Seseragi marsh Shiga highland Nagano, 2004
Intermediate ?
v. ehrenbergii 436 x 74 μm Ikenokochi marsh Tsuruga Fukui, 2004	v. ehrenbergii 420 x 70 μm Yoshi-numa Nasu-shiobara Tochigi, 2006	v. ehrenbergii ? μm L/W= Konpira bridge Shirakawa Fukushima, 2003	v. ehrenbergii 288 x 43 μm Izumi 741 Namegawa Saitama, 2004
v. ehrenbergii 454 x 66 μm Naruto-Togane Sanmu Chiba, 2006	v. ehrenbergii 570 x 87 μm Ukima Park Kita/Itabashi Tokyo, 2006
var. atumidum: Inner side not convex; 416-560 x 60-72 μm
v. atumidum 650 x 73 μm L/W= 9.8 curvature strong Musashi-Urawa Saitama, 2001	v. atumidum 525 x 70 μm L/W=7.5 curvature strong Narita Chiba, 2000	v. atumidum 568 x 60 μm L/W=9.5 Aizu Recreation p. Aizuwakamatsu Fukushima, 2005	v. atumidum 472 x 77 μm L/W=6.1 Numa-no-hara m. Madarao highland Niigata, 2005
v. atumidum ? 430 x 52 μm L/W=8.3 Senuki Nasu Tochigi, 2004	v. atumidum ? 608 x 76 μm L/W=8.0 Toneri Park Adachi-ku Tokyo, 2006
var. ???:
v. podolicum ? 275 μm L/W=4.5 Uruguay, 1999	C. ehrenbergii ? or C. moniliferum ? 250 μm L/W=6.1 Tochigi, 2000	C. ehrenbergii or C. moniliferum ? 275 μm Senjo-ga-hara Nikko Tochigi, 2003	C. ehrenbergii ? or C. moniliferum ? 209 μm L/W=5.8 Tochigi, 2000

Similar species -->> C. moniliferum; C. lunula;

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