postia sp. (postia undosa), inedible tree fungus on an old rotten tree trunk in the garden, ukraine

postia undosa fungus mushroom inedible tree trunk rotten garden ukraine nature wild decay biology species growth wood autumn ecology organic closeup environment mold wildlife spores botany natural preservation biodiversity spore aging decomposition habitat mycology flora identification detailed texture detail forest life nonedible fungi oligioporus rennnyi oligoporus farinosus strangulidium rennyi