bjerkandera fumosa, saprotrophic fungus growing on an old rotten stump of a large deciduous tree

bjerkandera fumosa fungus saprotrophic polypore meruliaceae basidiomycota agaricomycetes polyporales wooddecay whiterot bracket mushroom forest decay decomposer hardwood tree stump rotten nature biodiversity mycology macrofungi basidiomycete pores spore hyphae fruiting body smooth monomitic hyaline hemisphere taxonomy classification species genus