mushroom.   As the size increases, the full mature flavor develops.   Other cultivated species often now available include shiitake , maitake ( hen-of-the-woods ), oyster and enoki . Agaricus Blazei Murrill ( ABM) mushroom from Brazil contains Beta-(1-3)-D-glucan, Beta-(1-4)-a-D-glucan & Beta-(1-6)-D-glucan.   These long-chain polysaccharides are most potent immuno-potentiating (immune