The genus Crepidotus in Europe is considered. After an examination of 550 collections seventeen species and eight varieties are recognized. Two keys are supplied; all taxa accepted are typified. Morphological, ecological and chorological characters are critically evaluated. Descriptive statistics are used for basidiospore size. An infrageneric classification is proposed based on phenetic relationships using different cluster methods. The new combinations C. calolepis var. squamulosus and C. cesatii var. subsphaerosporus are introduced. The spore ornamentation as seen in the scanning electron microscope provides the best character for species delimitation and classification.