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Gamophyceae: Zygnematales: Desmidiaceae

Euastrum oblongum
(Greville) Ralfs ex Ralfs 1848

Euastrum oblongum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)

Species: Cell body elongated ellipsoidal, (115-162)-205 μm long, (60-78)-107 μm wide, L/W=2; semicells consisting of five lobes (one terminal, four lateral); bay opening between terminal and anterior lateral lobe is deeper and narrower than that between anterior and posterior lateral lobes; terminal lobe laterally extended forming fun-shaped structure; three spherical swellings at the base of semicells, with two additional swellings anteriorly (Illustrations of The Japanese Fresh-water Algae, 1977).


Euastrum oblongum (Greville) Ralfs var. oblongum, cell body 153 μm long, 73 μm wide, L/W=2.1, isthmus 21 μm wide, x 640, wetland near Ichinose-enchi (along super forest road), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum oblongum Euastrum oblongum Euastrum oblongum Euastrum oblongum
Cell body 158 μm long, 73 μm wide, L/W=2.2, isthmus 23 μm wide, x 400, x 640
Euastrum oblongum Euastrum oblongum Euastrum oblongum


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