Species [ var. orbiculare ]:
33.6-44.8 μm long, 28-39 μm wide, isthmus 7-11 μm wide;
semicells nearly semicircular in side view; cell wall dotted. [ var. ralfsii W. et G.S. West ]: 31-41 μm long, 22-36 μm wide, isthmus 7-11 μm wide; semicells close to triangular in side view. [ var. messikommeri Hirano ]: 21 μm long, 22 μm wide, isthmus 6.5 μm wide; semicells longitudinally depressed, semicircular or spindle-shaped in side view; bay opened. [ f. subangulata Messikommer ]: 39 μm long, 29.4 μm wide, isthmus 12.6 μm wide; semicells conical in side view; bay opened [ var. depressum Roy et Bisset ]: 19.6-29.4 μm long, 19.6-28 μm wide, isthmus 7-8.4 μm wide; semicells longitudinally depressed semicircular in side view. [ var. hibernicum W. et G.S. West ]: Larger than var. orbiculare, 42-65 μm long, 36-56 μm wide, isthmus 9.5-20 μm wide; apex of semicells flattened (Illustrations of The Japanese Fresh-water Algae, 1977). |
31 μm
63 μm
94 μm; x 640
Staurastrum orbiculare var. depressum Roy et Bisset ?,
cell body 28 μm long, 25 μm wide, L/W=, isthmus μm wide,
x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, September 24, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
31 μm
63 μm
94 μm; x 640
