All types of Pilát’s Crepidotus species available at PRM, W, and K have been studied. In addition Crepidotus harperi Sing. has been examined. For each taxon studied microscopical characters and SEM pictures of the spores are given, followed by a concise discussion of its status. In this first set of studies Pilát’s taxa C. carpatorossicus, C. carpaticus, C. cesatii var. gothoburgensis, C. kubickae, C. lundellii, C. macedonicus, and C. mollis var. pseudoapplanatus are being considered.