Padus serotina (Rosaceae), a new host plant for some species of parasitic microfungi

Four species of parasitic microfungi were collected recenUy on Padus serotina (Ehrh.) Borkh. (Rosaceae) in Poland. Three species, Phyllactina guttata (Wallr. ex Fr.) Lév. (Erysiphales), Monilia linhartiana Sacc. (Hyphomycetes), and Microsphaeropsis olivacea (Bonord.) Höhn. (Coelomycetes), have not been reported before on thc plant, and Padus serotina is a new host for them. Monnilia linhartiana Sacc. is a new species for Poland. The fourth species, Podosphaera tridactyla (Wallr.) de Baly var. tridactyla (Erysiphales), is known only from three localities in Europe, and has been collected on the host plant in Poland for the first time.