Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body large, (158-162)-205 μm long, (81-84)-106 μm wide, L/W=2, isthmus (25-26)-30 μm wide; semicells rectangular in shape, each consisting of 3 lobes; lateral lobes large, elongate rectangular, slightly concaved; cell wall covered with small pores (Illustrations of The Japanese Fresh-water Algae, 1977).
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E. crassum 168 x 82 μm L/W=2.0 Kenashitai Hakkoda mountain Aomori, 2005 |
E. crassum 180 x 90 μm L/W=2.0 Shimo-Kenashitai Hakkoda mountain Aomori, 2006  |
E. crassum 170? x 83 μm L/W=2.0 Tashirodaira m. Hakkoda mountain Aomori, 2005 |
E. crassum 180? x 87 μm L/W=2.1 Tashirodaira m. Hakkoda mountain Aomori, 2006 |
E. crassum 175 x 82 μm L/W=2.1 Sensho-ga-hara Shizukuishi Iwate, 2007 |
E. crassum 185 x 81 μm L/W=2.3 Kuroyachi marsh 3 Hachimantai Iwate, 2007 |
E. crassum 163,168 x 83,80 μm L/W=2.0,2.1 Mida-ga-hara Gassan (mt.) Yamagata, 2006 |
E. crassum 165 x 75 μm L/W=2.2 Oze marsh Katashina Gunma, 2006 |
E. crassum μm L/W= Numappara marsh Kuroiso Tochigi, 2003 |
E. crassum 185 x 92 μm L/W=2.0 Numappara marsh Kuroiso Tochigi, 2007 |
E. crassum μm L/W= Kareki-numa Nikko Tochigi, 2008 |
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E. crassum 180 x 92 μm L/W=2.0 Shijuhachi-ike Shiga highland Nagano, 2006 |
E. crassum μm L/W= Shijuhachi-ike Shiga highland Nagano, 2008 |
E. crassum 190 x 91 μm L/W=2.1 Tanohara marsh Shiga highland Nagano, 2005 |
E. crassum 175 x 82 μm L/W=2.1 Shimo-no-koike Shiga highland Nagano, 2004 |
E. crassum 162 x 78 μm L/W=2.1 Shimo-no-koike Shiga highland Nagano, 2004 |
E. crassum 152-168 x 74-83 μm L/W=2.0-2.1 Shibu-ike Shiga highland Nagano, 2005 |
