EN
The subject of the study was the analysis of fungal communities occurring in yellow iris phyllosphere and their effect on leaf healthiness. Fungi occurring on yellow iris caused various discolorations, spots and necroses which resulted in diminishing ornamental value of plants. From affected leaves of yellow iris following species of fungi were most often isolated: Alternaria alternata, Epicoccum purpurascens, Paecilomyces farinosus, Phoma medicaginis v. pinodella, Phoma pseudacori, Penicillium verrucosum v. corymbiferum, Phialophora cyclaminis, and Sordaria fimicola.