Hypsizygus tessulatus (Bull. ex Fr.) Sing. is redescribed from American material and compared with some European data on this species. Description of three European species of the Hohenbuehelia petaloides group are provided and slight differences between European and American collections of H. petaloides are pointed out. It is suggested that a species typified by a Mexican collection, H. recedens spec. nov., may be part of Ricken’s concept of Pleurotus geogenius. H. portegna is described from both American and European collections and closely related species are discussed. Pseudoclitocybe beschidica spec. nov. is compared with European and American representatives of this genus. Since the type species of Nothopanus must be transferred to Pleurotus, the European representative of this genus has to be known (again) as Pleurocybella porrigens (Pers. ex Fr.) Sing.
Singer R., Kuthan J. (1980): Comparison of some lignicolous white-spored American agarics with European species. – Česká Mykologie 34(2): 57–73.
