birch polypore mushrooms attached to a fallen birch trunk. tinder fungus. piptoporus betulinus.

acid agaric annual autumn bark betulina betulinus biology birch bracket closeup detail environment fall flora fomitopsidaceae fomitopsis forest fungal fungi fungus herbal macro medicinal mushroom mycology natural nature parasite pattern piptoporus polypore razor remedy september sponk strop stump toadstool touchwood tree trunk wood