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: Excisa (Cell surface granulated or dented; apical area with spiny projections)
Species:
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E. subalpinum 20 x μm Omine-numa Tsukiyono Gunma, 2003 |
E. subalpinum 21 x 18 μm Omine-numa Tsukiyono Gunma, 2007  |
E. subalpinum 19 x 14 μm Maimeno-ike Norikura highland Nagano, 2006 |
E. subalpinum 24 x 20 μm Ohnuma Nasu-shiobara Tochigi, 2007 |
