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Gamophyceae: Zygnematales: Desmidiaceae

Arthrodesmus triangularis
Lagerheim var. latiusculum (W. et G.S. West) HiranoLagerheim
= Staurodesmus triangularis (Lagerheim) Teiling 1967

Arthrodesmus triangularis 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:


Arthrodesmus triangularis var. latiusculum (W. et G.S. West) Hirano, cell body 22 μm long, 20 μm wide (excluding spines), L/W=1.1, isthmus 7 μm wide, spiny projection 9 μm long, x 640, drainage ditch at Kakuman-buchi, Akagi mountain, Fujimi village, Gunma Pref., Japan, May 27, 2007 by Y. Tsukii
Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus triangularis Arthrodesmus triangularis Arthrodesmus triangularis Arthrodesmus triangularis

Images of collecting locality: drainage ditch at Kakuman-buchi, Akagi mountain, Fujimi village, Gunma Pref., Japan, May 27, 2007 by Y. Tsukii


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