inonotus obliquus. black birch mushroom. chaga, a fungal infection on the trunk of a birch tree. birch bark with chaga mushroom .

affected alternative bark birch black chaga colours cracked dark education family flora forest fungal fungus growth healing health hymenochaetaceae infection inonotus isolated large medicative medicine mushroom nature obliquus old organic other parasite parasitizes pattern plant potential rock rough round shape sponge texture tree trees trunk white winter wood