Fu Ling, Poria (Poria Cocos) is a white mushroom on wood, in particular on the roots of Japanese red pine. Today it is mainly produced in Yunnan, Anhui, Hubei, Henan, Sichuan and other places in China. The common form of Poria is its sclerotium, most of which are in the shape of irregular chunk, sphere, compress form, oblong, or oval. They are in different sizes, usually less than 10cm in the smaller ones and 20cm to 30cm, even larger, in bigger ones. Skin is grayish brown or dark brown, and composed of numerous hyphae. Fruiting body looks like mushroom, 0.5 to 2mm in diameter.