Neofavolus alveolaris

Scientific name: Neofavolus alveolaris (DC.) Sotome
& T. Hatt.
Derivation of name:  Neo means "new"; favolus
means "honeycomb" and alveolaris means "with
small pits or hollows."
Synonymy:  Polyporus alveolaris (DC.) Bondartsev
& Singer; Favolus canadensis Kl.; Cantharellus
alveolaris DC.: Fr.; Polyporus mori Pollini; 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.
Comments: The first name I knew for this species
was Polyporus mori. Neofavolus alveolaris is likely
not the last name by which this species will be known.
The name N. alveolaris may be restricted to a
European species. Many iNaturalist postings now list
N. americanus as the species name for this fungus.
As for look-alike species, compare to Lentinus
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 Neofavolus
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.

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