Large, thick, velvety, brownish bracket fungus; thick margin; whitish pores. Grows on logs and stumps of deciduous trees. September–October. Cap semicircular with thick, rounded margin; ochre to dark brown, becoming blackish and concentrically zoned or ridged; texture finely hairy, fleshy when young, sometimes exuding a resinous, watery liquid; later becoming firm and hard with a black, resinous crust. Pores circular to angular; whitish to light brownish, bruising darker. Stalk not present. Spore print white. Spores magnified are cylindrical, smooth. When very young, the resinous polypore will often ooze amber-colored droplets of liquid.
Lookalikes: Ganoderma species are woody and hard at all stages and have a brownish red, varnished-looking crust.