89 species of the family MELASTOMATACEAE have been studied in the present part of our Catalogue from southern Brazil. The pollen grains all belong to the same pollinic type: prolate to perprolate grains, 3-colporate, 3-pseudocolpate, with psilate or lightly ondulate surfaces. It was possible divide the studied species in two large groups, according to the presence or not of an operculum at the pseudocolpi. Bertolonia, Ossaea, Salpinga and some species of Leandra show operculum wich has not been observed in the other studied species. The pollen granis from Mouriri show a largely reticulate surface, with colpi with costae as observed in Rhynchanthera. There is a correspondence between the taxonomic groups from this family and the pollinic groups previously stablished; however, it was not possible by using the pollen grain morphology, to recognise the species as well most of the genera.