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Gamophyceae: Zygnematales: Desmidiaceae

 Xanthidium armatum
(Brébisson) Rabenhorst ex Ralfs

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:

Xanthidium armatum (Brébisson) Rabenhorst ex Ralfs , cell body 125 μm long, 85 μm wide, isthmus 30 μm wide, x 400, x 640, Shimo-no-koike (small pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum
Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum

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).

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