hyphae white, mycelium of tree decomposing saprotrophic fungus on surface of trunk of old rotten tree, ukraine

hyphae white mycelium tree decomposing saprotrophic fungus surface trunk old rotten nature forest growth decomposition fungal network wood organic matter ecosystem biodiversity soil decomposer natural process macrofungi life biological decay spores function timber rot fungi mycology species 039 cycle ecological role structure microorganisms health bark