Lactocollybia aurantiaca Singer (Tricholomataceae, Basidiomycota): primeiro registro do Brasil

This work is part of the taxonomic study of the Tricholomataceae (Agaricales, Basidiomycota) found in the state of Rio Grande do Sul, Brazil. Lactocollybia aurantiaca Singer is recorded for the first time from Brazil based on a collection done in Rio Grande do Sul. Descriptions and illustrations of this species are presented.