Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections) Species: Cell body elongated ellipsoidal, 98-117-(123) μm long, 53-64-(67) μm wide, L/W=2; semicells consisting of five lobes (one terminal, four lateral); bay opening between terminal and anterior lateral lobe is deep and narrow; anterior lateral lobes smaller than posterior one; posterior lobes with slight depressions; terminal lobe laterally extended and apically flattened; semicell with 5 bulges (2 anterior, 3 posterior), 1 pore present between the anterior bulges (Illustrations of The Japanese Fresh-water Algae, 1977). |
31 μm
63 μm
94 μm; x 640
Euastrum affine,
cell body 105 μm long, 59 μm wide, L/W=1.8, isthmus 16 μm wide,
x 640, Kisuge konuma (a small pond near Mikura mountain 1888 h), Shimogo town, Fukushima Pref. (boundary at Nasu-shiobara city, Tochigi Pref.), Japan, August 29, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
31 μm
63 μm
94 μm; x 640
