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This illustration shows the sexual reproduction of Spirogyra: A, in lower portion of figure formation of the tubes between the opposite cells of the filaments is shown. Above the contents of two cells have united with two cells of another filament, forming two gametospores. B, germination of a gametospore.

Spirogyra

This illustration shows the sexual reproduction of Spirogyra: A, in lower portion of figure formation…

This illustration shows two common forms of the Zygnematales: A, Spirogyra- n, nucleus; p, pyrenoid. B, Zygnema.

Zygnematales

This illustration shows two common forms of the Zygnematales: A, Spirogyra- n, nucleus; p, pyrenoid.…