Definitions

from The Century Dictionary.

  • noun A genus of parasitic fungi of the family Peronosporaceæ, having the mycelium intercellular, the haustoria small and globular, the conidia sometimes forming, swarm-spores, and the oöspores globose, smooth, and brownish. About 15 species are known. P. viticola causes a serious disease of the grape known as downy mildew. See grape-mildew and cucumber mildew.

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