Bifunctional enzyme with lysozyme / chitinase activity. May have a role in plugging the latex vessel and cessation of latex flow. Random endo-hydrolysis of N-acetyl-beta-D-glucosaminide (1->4)-beta-linkages in chitin and chitodextrins. Hydrolysis of (1->4)-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues in a peptidoglycan and between N-acetyl-D-glucosamine residues in chitodextrins. In the lutoids (vacuoles) from rubber latex. Two components of hevamine have been isolated: hevamine A (shown here), the most abundant, and hevamine B. Belongs to the glycosyl hydrolase 18 family. Chitinase class II subfamily.