Definition of Erysiphales
: an order of saprophytic and parasitic ascomycetous fungi (subclass Euascomycetes) that live on plants, have both vegetative and reproductive structures superficial on the host, and include the powdery mildews, many sooty molds, and a few other epiphytic fungi — see erysiphaceae
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Origin and Etymology of erysiphales
New Latin, from Erysiphe + -ales
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