Where is the latest origin of Poria cocos?

Poria cocos is the dry sclerotia of Poria cocos, a pseudopore fungus, shaped like sweet potato, globular, light brown or dark brown outer skin, and pink or white inside. The ancients called Poria cocos a magic medicine at 04:00, because it has a wide range of effects, regardless of the four seasons, it is compatible with various drugs, no matter