Reevaluation of Hohenbuehelia nigra and species with close affinities

摘要

Specimens tentatively determined as Hohenbuehelia nigra var. microspora were found in the environs of Buenos Aires. Study of collections in BAFC identified by Singer as H. nigra showed that var. microspora differed considerably from var. nigra. This led to a study of the holotypes of H. nigra var. microspora and H. nigra var. nigra. In the present paper specimens of Hohenbuehelia nigra var. nigra (Schwein.) Singer are redescribed and compared with H. nigra sensu Singer and Digilio, and with H. subbarbata. The taxonomic position of H. nigra var. microspora Singer is defined, for which the new name H. singeri is proposed, whereas for H. nigra sensu Singer and Digilio the variety H. nigra var. pileocystidiata is proposed. [References: 19]