Be aware that dyer's polypore is saprobic and parasitic, eating away at the tree, causing brown rot, and potentially killing it. One of the uglier mushrooms to find on trees, Chaga fungus ...

Chaga, or inonotus obliquus ... The inonotus used for medicinal purposes grows on birch trees and can live on the tree trunk for up to 80 years. Its health-promoting effects were recognized ...