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

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