The genetic recombination does not necessary involve cellulase genes of both strains; it is more likely that general genes involved in the growth, if recombined, could produce some new interesting genotypes. Therefore, later after the possible genetic segregation of the heterokaryons, we selected clones that produced faster and clearer halos in the agar plate containing swollen cellulose. Occurrence of genetic recombinantion in fusion products was evaluated by Random Amplification of Polymorphic DNA (RAPD), and the fusants were studied for FPA and -glucosidases secretion in both submerged fermentation(SF)and insolid-state fermentation(SSF). The new strains obtained showed higher cellulolytic activity in submerged cultures and also faster and higher secretion of cellulases in solid-state cultivations in relation to parental strains.