Scientific name: Phellinus gilvus (Schwein.) Pat.
Derivation of name: Phellinus means "made of cork" or
"corky"; gilvus means "pale yellow."
Synonymy: Fuscoporia gilva (Schwein.) T. Wagner &
Polyporus gilvus (Schw.) Fr.
Common names: Mustard yellow polypore.
Occurrence on wood substrate: Saprobic; solitary or in
overlapping clusters or rows on dead deciduous wood;
sometimes on conifer wood; year-round.
Dimensions: Caps up to 15 cm wide and 2.5 cm thick.
Upper surface: Ochre to bright rust yellow or reddish brown
at first, darker (blackish) with age; margin often yellowish;
velvety and rough at first, becoming smoother in age; zonate
Pore surface: Grayish-brown to reddish or purplish-brown;
pores 6-8 per mm.
Comments: Phellinus gilvus is often an annual species but
may survive for several years under good conditions.
Figure 1. Brownish cap and yellow margin of this specimen
of Phellinus gilvus. Photo © Larry Grand.
Figure 2. The cap coloration is more uniform on these older
specimens. The dark pore
surface of the specimen on the
right is typical
of the species. Photo © Gary Emberger.