Species [ var. laevis ]: Cell body small in size, slightly constricted at the center, (70-120)-145 μm long, 17-(18-32) μm wide, L/W=3-4; semicells tapered from the base to ends, both ends broadly rounded with a deep incision at center; cell wall roughly dotted; lateral view spindle-shaped, tapering stronger than frontal view.
[ var. tropicus ]: Larger than var. laevis, 115-(134)-153 μm long, 24-(28) μm wide, L/W=5. (Illustrations of The Japanese Fresh-water Algae, 1977).
[var. minutus]: Cell body (37-)45-60(-75) μm long, (12-)17-20 μm wide, L/W=2.8-3.5, (Coesel & Meesters 2007).

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var. laevis: Cell body (70-)80-120(-145) μm
v. laevis ? 72 x 20 μm Tashirodaira m.6 Hakkoda mt. Aomori, 2006	v. laevis ? 69-78 x 24-25 μm Shimizu-daira Nasu Tochigi, 2005
var. minutus: Cell body (37-)45-60(-75) μm
v. minutus 56 x 19 μm Sukawa highland Kurikoma mt. Akita, 2007	v. minutus 63 x 20 μm Gozaisho marsh Hachimantai Iwate, 2005	v. minutus ? 50 x 18 μm Mida-ga-hara Gassan (mt.) Yamagata, 2005	v. minutus 58 x 17 μm Mida-ga-hara 5 Gassan (mt.) Yamagata, 2006
v. minutus 57 x 18.5 μm Mida-ga-hara 9 Gassan (mt.) Yamagata, 2006	v. minutus 57 x 19 μm Kisuge konuma Shimogo Fukushima, 2005	v. minutus 60 x 29 μm Shirakaba-Yachi Komado marsh Fukushima, 2007	v. minutus μm Miyatoko m.3 Minami-Aizu Fukushima, 2008
v. minutus 63 x 19 μm Karakemi marsh Yasaka Nagano, 2005	v. minutus 59 x 20 μm Karakemi marsh Yasaka Nagano, 2005	v. minutus 58 x 20 μm Karakemi marsh 5 Yasaka Nagano, 2007	v. minutus 56 x 18 μm Tanohara marsh Shiga highland Nagano, 2006
v. minutus 58 x 18 μm Tanohara marsh 1 Shiga highland Nagano, 2007	v. minutus 54 x 18 μm Hasu-ike Shiga highland Nagano, 2005	v. minutus 62 x 21 μm Imou bog 3 Toyohashi Aichi, 2006

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