poisonous mushrooms on the trunk of old tree covered with green lichen in the autumn forest with selective focus on blurred

background bark biological botany brown chaga crop dangerous edible environment fagus fall flora forest fungi fungus gastrointestinal group grow growing growth lichen murrill mushroom mushrooms mycology nature november october outdoor parasite plants poison poisonous poliporovy polyporaceae seasonal sparse sponge stripes sulphureus sylvatica system timber toadstool tree trees trunk wet wilderness