Species: 198-360 μm long, 20-40 μm wide; long cylindrical, somewhat flattened and slightly-twisted; anterior end rounded, posterior end pointed; numerous discoid chloroplasts; many rod-shaped paramylon (paramylum) bodies; no pyrenoids; nucleus big, cylindrical, lying in the center; stigma large (Zakrys, 1986).

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E. gigas 390 x 35, 360 x 40 μ 380 x 38, 370 x 50 μ striae/10μ stigma 10-12 μm φ chlo. 4 μm φ Vermont-Maine USA, 1999	E. gigas 370 x 40 μm 11-12 striae/10μ stigma 12 x 6 μm chlo. μm φ Mihashi Park Saitama, 2002	E. gigas 360 x 33 μm 8-9 striae/10μ stigma 12 x 6 μm chlo. 7 x 5 μm Tsuchiura Ibaraki, 2002	E. gigas 340 x 35 μm striae/10μ stigma μm chlo. μm φ Kodama Saitama, 2003
E. gigas 330 x 35 μm striae/10μ stigma 12 x 6 μm chlo. 4-5 μm φ Kurihashi Saitama, 2001	E. gigas μm striae/10μ O-ike park Yabuki Fukushima, 2003	E. gigas 410-420 x 36 μm striae/10μ Ishii Sakado Saitama, 2004	E. gigas 360 x 48 μm striae/10μ Futayo-no-ike Haguro mountain Yamagata, 2005
E. gigas 360 x 38 μm striae/10μ Suijo Park Gyoda Saitama, 2006	E. gigas μm striae/10μ Nogyo Fureai p. Toride Ibaraki, 2008

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