Phaeocollybia nigripes (Agaricomycetes), a new species from Brazil

Phaeocollybia nigripes is described from an Atlantic Forest fragment in Pernambuco, Northeast Brazil. It is characterized by a stipe that is uniformly slender with a slightly swollen base and dark grayish brown below to almost black at the apex, brown pileus, large basidiospores that average 12.4 × 6.6 μm, hyphoid to narrowly clavate cheilocystidia, and abundant clamp connections. The holotype of P. megalospora var. megalospora, the putatively most similar taxon, was examined. A key to the six taxa reported from Brazil is also presented.