Ampelomyces is a genus of mycoparasitic fungi in the family Phaeosphaeriaceae. Ampelomyces parasitizes the group of fungal plant pathogens known as powdery mildews (Erysiphales). The type species is Ampelomyces quisqualis which was circumscribed by Italian botanist Vincenzo de Cesati in Klotzsch, Bot. Ztg. vol.10 on page 301 in 1852.

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