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Gamophyceae: Zygnematales: Desmidiaceae

 Arthrodesmus subulatus
var. subaequalis W. et G.S. West
= Staurodesmus subulatus (Kützing) Thomasson 1963

Arthrodesmus subulatus 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 subulatus var. subaequalis (or Arthrodesmus rhomboides Hirano ?), cell body 38 μm long, 27 μm wide, spines 20-23 μm long, x 400, x 640, August 7-13, 1999, Vermont-Maine U.S.A., by Y. Tsukii
Arthrodesmus 50 μm Arthrodesmus 100 μm Arthrodesmus 150 μm; x 400 : Arthrodesmus 31 μm Arthrodesmus 63 μm Arthrodesmus 94 μm; x 640
Arthrodesmus Arthrodesmus Arthrodesmus
Arthrodesmus Arthrodesmus

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