Species [var. ehrenbergii]: Cell body medium in size, 220-739 μm long, 15-45 μm wide, L/W=11-20; semicells swelled at base, 7-10 wart-like projections circulary arranged arround both ends; chloroplasts band-form, with many pyrenoids; cellwall dotted.
[var. curtum]: Cell body short, 170-288 μm long, 17-32 μm, L/W=8-11.
[var. undulatum]: Lateral margins wavy, 290-700 μm long, 21-37 μm.
[var. crenulatum]: Semicells with two swellings at base, lateral margins slightly convex, 494-875 μm long, 37-58 μm.
[var. elongatum]: Cell body elongated, 390-575 μm long, 18-26 μm, L/W=19-25
[var. attenuatum]: (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. ehrenbergii: 220-739 μm long, 15-45 μm wide, L/W=11-20
var. ehrenbergii 550 x 40 μm L/W=13.8 Obihiro-Hasshonochi Obihiro Hokkaido, 2005	var. ehrenbergii 400 x 28 μm L/W=16 smooth surface Ishikawa, 2000	var. ehrenbergii 380 x μm L/W= smooth surface Aobano-mori Park Chiba, 2003	var. ehrenbergii 410 x 33 μm L/W=12.4 Kusatsu Onsen b.t. Kusatsu Gunma, 2005
var. ehrenbergii 424 x 25 μm L/W=17.0 Kumakubo Nasu-shiobara Tochigi, 2005	var. ehrenbergii 540 x 50 μm L/W=10.8 Numappara marsh 3 Nasu-shiobara Tochigi, 2007	var. ehrenbergii 680 x 34 μm L/W=20.0 Azami-ike Norikura highland Nagano, 2006	var. ehrenbergii 486 x 30 μm L/W=16.2 Miyatoko m.3 Minami-Aizu Fukushima, 2008
var. elongatum: 390-575 μm long, 18-26 μm, L/W=19-25
var. elongatum 614 x 31 μm L/W=19.8 Aka-ike Madarao highland Niigata, 2006	var. elongatum 504 x 21 μm L/W=28 hairs rare Ishikawa, 2000	var. elongatum 390 x 18 μm L/W=21.7 Kashibaru m.5 Karatsu Saga, 2006
var. attenuatum:
var. attenuatum 319 x 28 μm 303 x 32 μm L/W=13, 9.5 smooth surface Ishikawa, 2000
var. undulatum:
var. attenuatum 580 x 30 μm L/W=19.3 Kannon-numa 11 Shimogo Fukushima, 2008

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