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The Uredines and other epiphyllous Coniomycetes will readily germinate by placing the leaf which bears them on damp sand, or keeping them in a humid atmosphere.

Spermatia are very minute delicate bodies found associated with many of the epiphyllous Coniomycetes, and it has been supposed are produced in conjunction with some of the Sphæriacei, but their real function is at present obscure, and the name is applied rather upon conjecture than knowledge.