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Gamophyceae: Zygnematales: Desmidiaceae

Xanthidium antilopaeum
(Brébisson) Kützing var. antilopauem

Xanthidium Genus: Variable in shape; strong constriction at center; semicell ellipsoidal, polygonal, etc.; cell wall with simple or branching spines, most of them laterally aligned; 4 plate-like chloroplasts in each semicell; one or more pyrenoids in each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. antilopaeum) : Cell body 45-72 μm long, 43-71 μm wide, L/W = 1, constriction 13-25 μm wide, spines 19-22 μm long, semicells with 4 spines (2 anterior, 2 basal), cell wall at the center of semicells thickened and punctated (Illustrations of The Japanese Fresh-water Algae, 1977).


Xanthidium antilopaeum (Brébisson) Kützing var. antilopauem, cell body 50 μm long, 51 μm wide, L/W=1.0 (excluding spines, 9 μm), isthmus 14 μm wide, x 640, Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Xanthidium Xanthidium

Images of collecting locality: Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

X. antilopaeum (Brébisson) Kützing var. antilopauem: Cell body 45-72 μm long, 43-71 μm wide, L/W = 1, constriction 13-25 μm wide, spines 19-22 μm long, semicells with 4 spines (2 anterior, 2 basal), cell wall at the center of semicells thickened and punctated (Illustrations of The Japanese Fresh-water Algae, 1977).

X. antilopaeum var. laeve Schmidle: Cell body 79-90 μm long, 62-79 μm wide, constriction 20-34 μm wide, spines 19-22 μm long, semicells with 4 spines (2 anterior, 2 basal), cell wall at the center of semicells without thickened and punctated (Illustrations of The Japanese Fresh-water Algae, 1977).


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