Gamophyceae:
Zygnematales: Desmidiaceae
Euastrum affine
(Greville) Ralfs var. ??
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).
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Similar genus -->> E. affine, E. humerosum, E. pinnatum
Euastrum affine (Greville) Ralfs var. affine,
cell body 128 μm long, 77 μm wide, L/W=1.7, isthmus μm wide,
x 640, Utsubo-numa (a pond), Zao mountain, Zao onsen, Yamagata city, Yamagata Pref., Japan, July 13, 2008 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Euastrum humerosum Ralfs ?,
cell body 132 μm long, 69 μm wide, L/W=1.9, isthmus μm wide,
x 640, Utsubo-numa (a pond), Zao mountain, Zao onsen, Yamagata city, Yamagata Pref., Japan, July 13, 2008 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
Utsubo-numa (a pond), Zao mountain, Zao onsen, Yamagata city, Yamagata Pref., Japan, July 13, 2008 by Y. Tsukii
Please click on images for viewing enlarged.
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