Polyporus alveolaris

Scientific name:   Polyporus alveolaris (DC. Fr.)
Bond. & Sing.
Derivation of name:   Polyporus means "many pores";
alveolaris means "with small pits or hollows."
Synonymy:   Favolus canadensis Kl.; Cantharellus
alveolaris DC.: Fr.; Polyporus mori Polllini; Favolus
alveolaris Quel.
Common names:  Hexagonal-pored polypore.
Phylum:   Basidiomycota
Order:   Polyporales
Family:   Polyporaceae
Occurrence on wood substrate:  Saprobic; solitary to
grouped on fallen branches of deciduous trees; May
through November.  
Dimensions:  Caps 1-10 cm wide, semicircular to
kidney or fan-shaped; stipes (when present) 0.5-2 cm
long and 1.5-5 mm thick, lateral, stubby.   
Upper surface: Orange-yellow to reddish-orange,
fading to whitish; scaly.
Pore surface: Whitish to pale yellow; polygonal to
hexagonal, arranged in radial rows; pores are
conspicuous, 1-2 mm wide.
Edibility: Edible but tough.
Comments: Compare to P. arcularius which has a
circular cap and a central stalk.

More information at MushroomExpert.com:   

Figure 1. Hexagonal-pored polypore on a branch. Photo
© Tom Volk.

Figure 2. Orange-yellow, scaly caps of Polyporus
alveolaris. Photo © Gary Emberger.

Figure 3. Specimen showing the large polygonal, radially
arranged, pores of hexagonal-pored polypore. The pores
are not all six-sided as "hexagonal" might imply.
Photo © Gary Emberger.

Figure 4. Pores decurrent on lateral stipe.
Photo © David Work.

Figure 5. It's uncertain whether the pore surface, as it
appears above, is a normal developmental stage or
something unusual with this specimen. See Figure 6 for a
photograph of a similar pore surface on a NEMF
specimen collected in 2003. Photo © R. Al Simpson.

Figure 6. Polyporus alveolaris collected during a NEMF
foray in 2003. Photo © Gary Emberger.