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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 115 μm long, 90 μm wide, L/W=1.3, isthmus 30 μm wide, spiny projections 15 μm long, x 640, Iroha-numa (marsh/bog), east side of Nakadaiten, Azuma mountains, Kitashiobara village, Yamagata Pref., Japan, July 1, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Xanthidium armatum Xanthidium armatum Xanthidium armatum
Cell body μm long, μm wide, L/W=, isthmus μm wide, x 640
Xanthidium armatum Xanthidium armatum Xanthidium armatum

Images of collecting locality: Iroha-numa (marsh/bog), east side of Nakadaiten, Azuma mountains, Kitashiobara village, Yamagata Pref., Japan, July 1, 2007 by Y. Tsukii

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