First Polish records of Myxomycetes rare in Europe

Seven species of Myxomycetes are reported from Poland for the first time. These are Arcyria virescens, Cribraria costata, C. elegans, C. languescens, C. mirabilis, C. pertenuis and Trichia flavicoma. They have very few localities in Europe and Cribraria pertenuis is known only from two sites worldwide. The species are described and illustrated with microphotographs, including first published micrographs of C. pertenuis. Localities are given and the taxonomy and ecology of each species are discussed.