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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 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
scale 31 μm scale 63 μm scale 94 μm; x 640
Xanthidium armatum Xanthidium armatum Xanthidium armatum

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).

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