 The fruit bodies of "Aureoboletus mirabilis" grow solitarily, scattered, or sometimes in small groups on the ground or on well-decayed conifer logs, especially of western and mountain hemlock, but occasionally also Douglas-fir and western red cedar.The fungus is strongly suspected to form mycorrhizal associations with hemlock, although standard attempts at growing "B. mirabilis" mycorrhizae in laboratory culture have failed.Although fruit bodies are sometimes found growing on logs with advanced brown cubical rot—a trait suggestive of cellulose-decomposing saprobic fungi—the rotten wood harboring the fungi typically contains abundant conifer roots.