giant fungus parasite chaga on the trunk of a birch.shelf fungus medical mushroom.inonotus obliquus

antioxidant antioxidants arboreal bark biology birch black botanical brown cancer chaga closeup dry environment flora forest fungi fungus herbal herbalism immunodeficient inonotus large macro medical medicaments medicinal medicine mushroom mycelium mycology natural nature north northern object obliquus outdoor parasite parasitic plant rough round shelf sponge therapeutic tree trunk wild wood