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Gamophyceae: Zygnematales: Desmidiaceae

Sphaerozosma excavatum
Ralfs
-->> Teilingia excavata (Ralfs) Bourrelly

Sphaerozosma excavatum Genus: Cell body flat, constricted at the center; semicells with two small projections at their apexes; cells connected with each other by the projections.
Species: Filaments not twisted; cells loosely connected to be separated; cell body 8.4-11 μm long, 7-10.8 μm wide, constriction 4-6 μm wide; semicells broad hexagonal in shape, apex slightly depressed, with two short projections to connect with adjacent cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar genus -->> Onychonema;


Sphaerozosma excavatum Ralfs, cell body 9 μm long, 9.5 μm wide, L/W=0.9, isthmus 5 μm wide, x 640, No. 2, Iroha-numa (marsh/bog), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Sphaerozosma Sphaerozosma
Cell body μm long, μm wide, L/W=, x 640
Sphaerozosma

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


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