Grifola frondosa is a Basidiomycete fungus belonging to the order Aphyllopherales , and family Polyporaceae. The fruit body and liquid-cultured mycelium of this mushroom have been reported to contain useful anti-tumor polysaccharides from various fractions. These polysaccharides have been identified as glucans (e.g. β-1,6- and β-1,3-).