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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 120 μm long, 77 μm wide (excluding spines), L/W=1.6, isthmus 30 μm wide, spiny projections about 10 μm long, x 400, x 640, Ushidome-ike (pond), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 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
Cell body 116 μm long, 80 μm wide (excluding spines), L/W=1.5, isthmus 30 μm wide, spiny projections about 8 μm long, x 400, x 640
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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