tinder fungus on tree trunk

autumn background bark birchs brown cap chirurgorum closeup collection color countries crop damp deciduous detail discovery flammable flora fomentarius fomes forest fungi fungus green growth hat macro medicinal mushroom mushrooms natural nature parasite pattern picking plant polyporaceae pore rotting season spore stem stunted summer texture textured textures timber tinder toadstool tree trees trunk uncultivated vertical white wilderness wood wooden