chaga mushroom inonotus obliquus parasitize on a birch trunk. side view, close-up. used for healing tea or coffee in folk

bark birch booster chaga close closeup coffee color dark digestive flora folk food forest fungus germinate grey healing healthy herb herbal immune infection inonotus large medicinal medicine mushroom natural nature naturopathy object obliquus organic parasite parasitize pathogen side solid sponge spores tea therapeutic therapy tree trunk used view white wild wood