Polysaccharide from the rhizomorph of cultivated Armillaria mellea (A.m)(AMPc) and its immunological activity were compared with that of wild A.m(AMPw). These data showed that the content of AMPw and AMPc was 22.37g/kg and 150.03g/kg, respectively. AMPw or AMPc given ig 300mg/kg/d obviously enhanced the delayed type hypersensitivity (DTH) response and stimulated the production of hemolysin in normal mice. There were no evident difference between the effect of AMPw and that of AMPc. The results have proven t...