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Gamophyceae: Zygnematales: Desmidiaceae

Euastrum insulare
(Wittrock) Roy var. silesiacum Grünblad,

Euastrum 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: Atomum (Apical area slightly depressed)
Section: Retusa (Cell body large; granulated dome(s) at the center of each semicell)

Species:
Similar species -- >> E. platycerum; E. egregium;


Euastrum insulare (Wittrock) Roy var. silesiacum Grünblad, cell body μm long, μm wide, L/W=, isthmus μm wide, x 640, No.2, Hachiman-numa marsh, Hachimantai, Hachimantai city, Iwate Pref., Japan, August 23, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum insulare Euastrum insulare Euastrum insulare

Images of collecting locality: No.2, Hachiman-numa marsh, Hachimantai, Hachimantai city, Iwate Pref., Japan, August 23, 2007 by Y. Tsukii


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