Ripartitella (Agaricales) from an Atlantic Forest in Pernambuco, Brazil

摘要

This paper presents two neotropical species of Ripartitella collected at Northeast Brazil: R. alba is a new record from Brazil, and R. brasiliensis is cited for the first time from this Brazilian region. A key to species, descriptions, discussion, drawings and scanning electron microscopy (SEM) are provided. Ripartitella Singer was originally placed in Agaricaceae Cheval. tribe Cystodermatae Fayod, near to the lepiotoid genus Cystoderma Fayod, mainly because of the similarity of cystidia (Singer 1947, 1986). Some authors, using morphological and anatomical data (e.g., Pegler 1977, 1983, Ovrebo 1988, Franco-Molano 1993) and molecular data (Johnson & Vilgalys 1998), excluded these genera from Agaricaceae and transferred them to Tricholomataceae R. Heim ex Pouzar. Hawksworth et al. (1995) and Kirk et al. (2001) also considered these genera in Tricholomataceae, but Moncalvo et al. (2000,2002) conclude that the taxonomic position of Ripartitella and Cystoderma remains unresolved.In Brazil, only R. brasiliensis was previously reported (Singer 1950, 1953, Pegler 1997, Matheus et al. 2000, Okino et al. 2000).