Genus: Variable in shape and in size; mostly longer than wide; strong constriction at center; semicell pyramid-shaped, apically flattened with indentation (or notch, some species lack this notch); laterally straight or wavy or indented; one chloroplast in each semicell; one pyrenoid for each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: (Illustrations of The Japanese Fresh-water Algae, 1977).
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E. pinnatum 120 x 62 μm L/W=2.0 Tashirodaira m. Hakkoda mountain Aomori, 2005 |
E. pinnatum 130 x 73 μm L/W=1.8 Tashirodaira m. Hakkoda mountain Aomori, 2006  |
E. pinnatum μm L/W= Ohyachi 2 Hachimantai Akita, 2007 |
E. pinnatum μm L/W= Ohyachi 3 Hachimantai Akita, 2007 |
E. pinnatum 114* x 57 μm L/W=2.0 Mida-ga-hara 9 Gassan (mt.) Yamagata, 2006 |
