New species and records of Pouzarella (Agaricomyetes, Entolomataceae) from northern Argentina

five new species of pouzarella are described from northern argentina, p. brunneonigrescens, p. olivacea, p. parvispora, p. sulcata and p. variabilis. pouzarella ferreri var. ferreri is also reported for the first time from argentina. all known pouzarella species reported from argentina are discussed and a key to species is provided.