Gamophyceae:
Zygnematales: Desmidiaceae
Xanthidium armatum
(Brébisson) Rabenhorst ex Ralfs
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:
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Xanthidium armatum (Brébisson) Rabenhorst ex Ralfs ,
cell body 116 μm long, 80 μm wide, isthmus 30 μm wide (excluding spines),
spiny projections 6-8 μm long,
x 640, Ushidome-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
Ushidome-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
Xanthidium armatum (Brébisson) Rabenhorst ex Ralfs:
Cell body (without spines) 115-153 μm long, 81-104 μm wide,
isthmus 35-42 μm wide (Illustrations of the Fresh-water Algae, 1977).
Please click on images for viewing enlarged.
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