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Gamophyceae: Zygnematales: Desmidiaceae

Xanthidium cristatum
Brébisson in Ralfs 1848 var. uncinatum Brébisson

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: Cell body (without spines) 43-80 μm long, 43-53 μm wide, isthmus 13-14 μm wide, semicells with two anterior, two lateral, one basal spines, with a centrally located large granule surrounded by about 10 small granules (Illustrations of the Fresh-water Algae, 1977).


Xanthidium cristatum Brébisson var. uncinatum Brébisson or similar species, cell body 51 μm long, 48 μm wide, isthmus 12 μm wide, x 400, x 640, Uruguay, November 1999, photo by Yuuji Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Xanthidium Xanthidium Xanthidium Xanthidium
Xanthidium Xanthidium Xanthidium Xanthidium

Xanthidium cristatum Brébisson var. uncinatum Brébisson: Cell body (without spines) 43-80 μm long, 43-53 μm wide, isthmus 13-14 μm wide, semicells with two anterior, two lateral, one basal spines, with a centrally located large granule surrounded by about 10 small granules (Illustrations of the Fresh-water Algae, 1977).

Xanthidium cristatum var. leiodermum (Roy et Bisset) Turner: Cell body (without spines) (42-48)-54 μm long, 34-39 μm wide, isthmus (11)-13 μm wide, semicells with two anterior, two lateral, one basal spines, without central bulging, (Illustrations of the Fresh-water Algae, 1977).


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