Detailed descriptions, illustrations, discussions and a key for identification of the known species of the genus Hypholoma (Fr.) P. Kumm. in Rio Grande do Sul state are presented, as well as a revision of the Hypholoma specimens deposited in the Fungi Rickiani collection. Based on the authors' collections and the herbarium revision, the following species were recognized: H. aurantiacum (Cooke) Faus, H. ericaeum (Pers.: Fr.) Kühner, and H. subviride (Berk. & M.A. Curtis) Dennis.
Basidiomycota; Agaricomycetidae; Stropharioideae; Nematoloma; Brazilian mycobiota
