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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 μm long, μm wide, L/W=, isthmus μm wide, x 640, No.4, Iroha-numa (marsh/bog), Zao mountain, Kaminoyama city & Yamagata city, Yamagata Pref., Japan, July 13, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Xanthidium armatum Xanthidium armatum Xanthidium armatum Xanthidium armatum

Images of collecting locality: No.4, Iroha-numa (marsh/bog), Zao mountain, Kaminoyama city & Yamagata city, Yamagata Pref., Japan, July 13, 2008 by Y. Tsukii

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