Neotropicomus australis var. porulosus is characterized macroscopically by the small basidiomata, the dark reddish brown, slightly viscid and scrobiculate pileus with unchanging context, the greenish and unchanging hymenophore with small (≤0.5 mm in diam.) pores and the brownish stipe with unchanging context, creamy towards the base and fibrillose. Microscopically, the variety is characterized by pale to slightly dark yellowish basidiospores of 11.7–13.3(–13.8) × 4.1–5.1 µm, a pileipellis as epithelium consisting of erect to suberect then sometimes very slightly intertwined chains of aggregated globose, subglobose to ellipsoid cells, a phylloporoid tube trama, subparallel to barely divergent, and some caulocystidia with apex bearing an elongate cylindrical projection. The new taxon is described here from the Caatinga biome, in a ‘brejo de altitude’ forest in the states of Paraíba and Pernambuco. Thus, this is the first record of this genus from northeastern Brazil. We also propose here a modification of the genus to include small-pore specimens, and a new combination of Xerocumus globuliger with Neotropicomus.