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Gamophyceae: Zygnematales: Desmidiaceae

 Arthrodesmus incus
(Brébisson) Hassall var. incus
= Staurodesmus incus (Brébisson) Teiling 1967

Arthrodesmus incus Genus: Cell body small, length = width, strong constriction at its center; semicells inverted triangular, ellipsoidal, rectangular, etc. in shape; straight or slightly curved spiny projections at each corner; one pyrenoid in each semicell; cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Semicells inverted semicircle or hexagon in shape; (Illustrations of The Japanese Fresh-water Algae, 1977).

Arthrodesmus incus (Brébisson) Hassall var. incus, cell body 16 μm long, 16 μm wide, L/W=1.0 (excluding spiny projections 10 &3956;m), isthmus 5.5 μm wide, x 640, No. 3, Iroha-numa (marsh/bog), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus

Images of collecting locality: No. 3, Iroha-numa (marsh/bog), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii

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