Lentinus brumalis

Scientific name:   Lentinus brumalis (Pers.) Zmitr.
Derivation of name:  Lentus means "pliable" and
"tenacious" as in chewy; brumalis means "winter"
referring to its appearance in cool seasons of the year.
Synonymy:   Boletus brumalis Pers.; Polyporus brumalis
Pers.) Fr.
Common names:   Winter polypore.
Phylum:   Basidiomycota
Order:   Polyporales
Family:   Polyporaceae
Occurrence on wood substrate:  Saprobic; solitary or
grouped on decaying deciduous wood; October through
June.  
Dimensions:  Caps 1.5-10 cm wide; stipes 2.5-5 cm long
and 1.5-5 mm thick, colored like the cap or paler.  
Upper surface: Yellow-brown to dark brown or nearly
black; finely hairy.
Pore surface: Whitish; pores somewhat angular; pores 2-3
per mm.
Edibility: Inedible.
Comments: Interestingly, although DNA evidence places
the genus Lentinus among the polypores, other members
of the genus have gills, not pores. Gills, apparently, arose
independently in different fungal lineages. Compare L.
brumalis to L. arcularius which has a paler, scaly cap
with a fringed margin and larger pores.

More information at MushroomExpert.com:  

    
Figure 1. Note the intensely dark cap surface and white pore
surface. Photo © Steve Nelsen.

Figure 2. Cap and pore surfaces. Photo © Steve Nelsen.

Figure 3. Lentinus brumalis specimens collected during
the 2003 NEMF foray.
Photo © Gary Emberger.