Species [ var. oblongum ]: Cell body cylindrical ellipsoid, both ends broadly rounded; laminae of chloroplasts deeply dented showing circular depressions; 108-148 μm long, 27-39 μm wide, L/W=3-4.
[ var. cylindricum W. et G.S. West ]: Smaller than var. oblongum; 60-90 μm long, 17-25 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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N. oblongum 122 x 33 μm L/W=3.7 Kenashitai Hakkoda mountain Aomori, 2005	N. oblongum 117-199 μm L/W=3.3-4.9 Sukawa highland Kurikoma mt. Akita, 2007	N. oblongum 108 x 33 μm L/W=3.3 Oh-numa m8 Hachimantai Akita, 2007
N. oblongum 109,126.5 μm L/W=3.2,3.6 Sensho-ga-hara Shizukuishi Iwate, 2007	N. oblongum 174 μm dividing cell? Sensho-ga-hara Shizukuishi Iwate, 2007
N. oblongum 97-103 x 31-33 μm L/W=2.9-3.3 Mida-ga-hara Gassan (mt) Yamagata, 2006	N. oblongum 103 x 36 μm L/W=2.9 Tojuro Azuma mt. Yamagata, 2007	N. oblongum 101 x 35 μm L/W=2.9 Yahei-daira m.4 Azuma mt. Yamagata, 2007	N. oblongum 130 x 32 μm L/W=4.1 Midagahara Tateyama Toyama, 2006
N. oblongum 125 x 35 μm L/W= Yokotashiro 4 Katashina Gunma, 2008
N. oblongum 157 x 33 μm L/W=4.8 Ukishima marsh Tsugaike highland Nagano, 2006	N. oblongum 109-126 x 32-33 μm L/W=3.2-4.2 Ukishima marsh Tsugaike highland Nagano, 2005	N. oblongum 128 x 32 μm L/W=4.0 Watasuge marsh Tsugaike highland Nagano, 2005	N. oblongum 148 x 32 μm L/W=4.6 Kamino-tanbo Tsugaike highland Nagano, 2006
N. oblongum 105-131 x 32.5 μm L/W=3.3-4.0 J Skunk Cabbage m. Tsugaike highland Nagano, 2006
N. oblongum 120-164 x 34 μm L/W=3.5-4.8 Shijuhachi-ike Shiga highland Nagano, 2006.6	N. oblongum 125.5 x 34 μm L/W=3.7 Shijuhachi-ike Shiga highland Nagano, 2006.10	N. oblongum 125,153 μm L/W=3.6,4.6 Shijuhachi-ike 4 Shiga highland Nagano, 2007
N. oblongum 122 x 34 μm L/W=3.6 Chigo-ike 4 Yakebitai mt. Nagano, 2006.10	N. oblongum 120 x 35 μm 145 x 35 μm Chigo-ike Yakebitai mt. Nagano, 2008.7	N. oblongum 153 x 34 μm 123 x 35 μm Chigo-ike Yakebitai mt. Nagano, 2008.7
N. oblongum 107, 127 μm L/W=3.4, 4.0 Karakemi marsh Yasaka Nagano, 2005	N. oblongum 122-160 μm L/W=3.5-4.0 Karakemi marsh Omachi Nagano, 2007
N. oblongum large variety ? 235 x 63 μm L/W=3.7 Watasuge marsh Tsugaike highland Nagano, 2005	N. oblongum large variety ? 208 x 65 μm L/W=3.2 6 laminae ? Karakemi marsh Yasaka Nagano, 2005	N. oblongum large variety ? 224 x 65 μm L/W=3.4 6 laminae ? Midagahara Toyama Nagano, 2006

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