However, four Postia species from Argentina, namely P. pelliculosa, P. punctata, P. dissecta and P. carbophila, weakly grouped with species in Postia s.str., of which P. pelliculosa and P. punctata consistently formed a separated lineage with high support (100 % MP, 100 % BS, 1.00 BPP) in accordance with Pildain & Rajchenberg (2013), while P. dissecta and P. carbophila were grouped together in a separated lineage with no significant support (Fig. 1). In the phylogeny inferred from the combined 7-gene dataset (Fig. 2), 41 species of Postia s.lat. were divided into ten monophyletic clades, and four new genera were established for monophyletic groups here. However, phylogenetic positions of four species of Postia from Argentina are not resolved because only limited gene sequences are available for them. Morphologically, P. pelliculosa and P. punctata have thick-walled, ellipsoid basidiospores that are consistent with species of Oligoporus s.str. (Rajchenberg 1987, Rajchenberg & Buchanan 1996); P. carbophila is similar to Rhodonia placenta (Rajchenberg 1995); P. dissecta is characterized by dimidiate basidiocarps with applanate pileus and cylindrical basidiospores (Rajchenberg 1987), which are similar to species of Spongiporus s.str. But their positions in the respective genera are not supported in the phylogenetic analysis (Fig. 1). For the time being, we still retain these four species in Postia s.lat