Summary:
Features include 1) a bronze to purplish brown fruitbody with a ciliate margin, 2) radially elongated, diagonal, whitish pores, 3) a central stem, and 4) growth on hardwoods. It is common in the east but rare in the west, (Gilbertson). The online Species Fungorum, accessed September 3, 2018, gave the current name as Lentinus brumalis (Pers.) Zmitr., International Journal of Medicinal Mushrooms (Redding) 12(1): 88 (2010), but MycoBank gave that name as a synonym of Polyporus brumalis (Pers.) Fr.

Odor:
fungoid (Breitenbach)

Taste:
mild (Breitenbach)

Microscopic:
spores 6-7.5 x 2-2.5 microns, cylindric, slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 16-22 x 5-6.5 microns, clavate, with basal clamp; cystidia absent; hyphae dimitic, generative hyphae of context 4-10 microns wide, colorless, thin-walled, with clamp connections, occasionally branched, binding hyphae of context with swellings up to 13 microns wide but mostly 4-10 microns wide, with dendritic branching and branches tapering to 1-2 microns wide, colorless, thick-walled, nonseptate, hyphae of trama 2.5-6 microns, similar, less frequently branched, (Gilbertson), spores 5-7 x 1.5-2.5 microns, cylindric to sausage-shaped, smooth, (Phillips)

Spore Deposit:
white (Phillips)

Notes:
Polyporus brumalis has been found in BC, WA, OR, ID, MB, NB, NS, NF, ON, PQ, SK, AR, CT, DE, IA, IN, KS, KY, MA, ME, MI, MN, MT, NH, NJ, NY, OH, PA, TN, VT, WI, and WV, (Gilbertson).

EDIBILITY

no (Phillips)

Synonyms and Alternate Names:
Annulohypoxylon multiforme "(Fr.) Y.M. Ju, J.D. Rogers "
Hypoxylon multiforme Fr.