Ischnoderma resinosum

Scientific name:  Ischnoderma resinosum (Fr.) Karst
Derivation of name:   Ischnoderma means "with withered
or wrinkled skin"; resinosum means "resin-like"
Synonymy:   Polyporus resinosus Fr.
Common names:   Resinous polypore.
Phylum:   Basidiomycota
Order:   Polyporales
Family:   Hapalopilaceae
Occurrence on wood substrate: Saprobic; solitary or
grouped, sometimes in overlapping clusters on decaying
deciduous wood such as stumps and logs; September
through November.  
Dimensions:  Caps up to 25 cm wide and 2.5 cm thick.   
Upper surface:  Brownish-orange to dark brown, becoming
blackish; velvety when young, becoming glabrous revealing
thin resinous crust; margin thick, exuding amber-colored
droplets when young.
Pore surface: Whitish, bruising brown; pores 4-6 per mm.
Edibility: Inedible.
Comments: The flesh of young specimens is soft and sappy
(juicy) at first.

More information at MushroomExpert.com:   


Figure 1. The species is fairly durable. These were found on
New Year's Day in South Central Pennsylvania.

Figure 2. The surface may be concentrically and
radially furrowed and zonate.

Figure 3. In contrast to the specimens of Figure 1, these
are young specimens growing in the Fall. Note the whitish
growing margin.

Figure 4. Top surface (left) and pore surface of Ischnoderma
resinosum.

Figure 5. The brown bruising of the pore surface is
characteristic of this species.

Figure 6. When very young, Ischnoderma resinosum often
exudes droplets of moisture. Photo © Pam Kaminski.

Figure 7. The amber-colored droplets are only on the young
growing margin.