In 2010–2011 the studies on identification of parasitic fungi on selected tree species were carried out in the Dendrological Garden in Przelewice were performed. The research materials were above-ground parts of 9 plant species: Betula pendula, Betula maximowicziana, Cornus kousa, Acer pseudoplatanus, Acer negundo, Magnolia stellata, Robinia pseudoacacia, Populus tremula and Cerasus serrulata. As a result of the micological analyses 17 species of fungi were identified. The most numerous species (13) belonged to anamorphic fungi. The identified species of fungi belonged to 15 types. The largest number of types (11) belonged to anamorphic fungi. Basidiomycota and Ascomycota were represented by 2 types of fungi. Among others the following species were found: Diplodia atrata, Melasmia acerina, Uncinula bicornis, Melanconium betulinum, Stigmina carpophila, Phyllactinia guttata, Septoria cornicola, Colletotrichum gloeosporioides, Phyllosticta magnoliae, Asteroma frondicola, Melampsora populnea.