bottom view of a crying mushroom growing on a tree trunk close up against a background of bark

background backgrounds bark biology botany branch brown chaga close closeup disease environment flora foliage forest fungi fungus green grow ice inonotus man medicinal mushroom mushrooms nature obliquus old organic outdoors parasite parasitical parasitize plant polyporaceae polypore rough silvan spores stump summer sunny surface thicket tree trunk up wild wood wooden woodsy yellow