chaga mushroom inonotus obliquus on the trunk of a tree on a background of yellow autumn foliage. close-up

agaric autumn background bark beautiful biology brown chaga closeup conk decoration edible fall foliage forest fungi fungus ground group grow kreftkjuke leaf macro meadow medicinal medicine mushroom natural nature obliquus organism outdoor parasitic plant schiefer schillerporling season shrooms sterile summer toadstool tree trunk wild wilderness wood wooden woodland yellow