close-up of a woody fungus growing on the bark of a tree in a park in odessa

brown fungus trutovik bark tree mycology wood decay decomposition odessa park nature mushroom basidiomycete hyphae spore conk bracket forest ecology saprotroph symbiosis lignin cellulose biodiversity organism sporocarp mycelium habitat cap gills spores parasitic saprobic shelf perennial fruiting body substrate ecosystem biota interaction antennae closeup woody growing