(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body wedege-shaped, heart-shaped or pyramidal, with a stalk gradually merging with cells (The Freshwater Algal Flora of the British Isles, 2002).
Sorastrum americanum (Bohlin) Schmidle var. americanum,
cell body μm long, μm wide,
x 640, Aquatic botanical garden, Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
31 μm 63 μm 94 μm; x 640