Type specimen studies in Pleurotus

An epitype specimen is designated for Pleurotus cornucopiae. Morphological examination of Mexican material and the type specimen of P. opuntiae showed that the distribution of this species includes North Africa and the highla nds of Mexico. The type specimen of Lentinus (Pleurotus) eugrammus reveals that Singer based his proposal of Nothopanus on a mistaken interpretation o f L. eugrammus, and that the concept of Nothopanus requires a new name and type species. Neonothopanus is proposed to solve this problem. Morphologica l reports are supplemented with data on mating systems.