Chaga

Chaga is a black parasitic fungus that grows in the trunk of the birch tree. Because its typically grows at higher latitudes where low temperatures make the fungi’s growth slow, infected trees can grow for 30-80 years without signs of decline.

Source: Ern, P.T.Y.; Quan, T.Y.; Yee, F.S.; Yin, A.C.Y. Therapeutic properties of Inonotus obliquus (Chaga mushroom): A review. Mycology. 2023, 15 (2), 144-161. DOI: 10.1080/21501203.2023.2260408