Inonotus obliquus is considered a parasite and brings about white rot about the heartwood in the trees. It infects its host via spores that enter wounds over the bark. Evidence suggests spores are likely dispersed by insects. The commonest hosts are birch trees involving 30 and fifty years of age. https://cristianufpaj.blogdomago.com/31441354/adaptogenic-mushrooms-no-further-a-mystery