Abstract
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.
Highlights
Specimens tentatively determined as Holt eubuchelia nigra val'. microspora were found in the en virons of Buenos Aires
All collections are deposited in the mycological Herbarium, During a revision of the genus Hohenbuehelia in Ar gcntina, a rather abundant species was found in the province of Buenos Aires, which we tentatively deter mined as H. nigra var. microspora Singer, belonging
The study of a few collections in BAFC identified by Singer as H. nigra showed that val'. microspora differed considerably
Summary
Carolina; his description was based on a study of the Schweinitz holotypes extant at BPI and Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Bio16gicas, Ciudad Universitaria, Pab. Libonati-Barnes (1981) indicated two interpre tations of H. nigra: one by Coker (1944) and another by Singer and Digilio (1951) who pointed out that the type of Agaricus subbarbatus Berk. & Curtis from Cuba was very similar to Hohenbuehelia nigra
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