from The Century Dictionary and Cyclopedia
- n. A genus of rust-fungi, of the order Uredinales, having æcidia of the Cæoma type, uredospores with numerous germ-pores, and several-celled teleutospores. About 30 species are known, some of which cause serious diseases of cultivated plants. P. subcorticium attacks the leaves and stems of roses. See rose-rust.
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