Scientific name: Bjerkandera adusta (Willd.) P. Karst.
Derivation of name: Bjerkandera honors C. Bjerkander;
adust- means "scorched" or "appearing
burned" in reference
to the dark pore surface.
Synonymy: Polyporus adustus Willd.:Fr.
Common names: Smoky polypore.
Occurrence on wood substrate: Saprobic; forming
overlapping, stalkless caps on decaying deciduous wood,
conifer wood; July through November,
Dimensions: Caps 3-10 cm wide; 1-6 cm long; 0.1-0.8 cm
Upper surface: Dirty white or gray or tan; hairy.
Pore surface: Pores minute (6-7 per mm); grayish, bruising
Comments: Compare to Bjerkandera fumosa. Caps of
Bjerkandera adusta are thinner and generally have a darker
More information at RogersMushrooms.com:
Figure 1. The upper surface of this polypore is usually
whitish or tan and quite hairy. Photo © Gary Emberger.
Figure 2. The lower gray pore surface is quite striking.
Photo © Gary Emberger.
Figure 3. Another specimen showing the gray pore surface
and some of the tan-colored cap surfaces. Photo © Tom
Figure 4. The upper tan surface of Bjerkandera adusta
the lower gray pore surfaces with whitish margins.
Photo © Larry Grand.
Figure 5. Note the dark bruising on the gray pore surfaces.
Photo © Dianna Smith.