Bjerkandera adusta

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.
Phylum:   Basidiomycota
Order:   Polyporales
Family:  Meruliaceae
Occurrence on wood substrate:  Saprobic; forming
overlapping, stalkless caps on decaying deciduous wood,
sometimes conifer wood; July through November,
overwinters.  
Dimensions:  Caps 3-10 cm wide; 1-6 cm long; 0.1-0.8 cm
thick.  
Upper surface: Dirty white or gray or tan; hairy.        
Pore surface:  Pores minute (6-7 per mm); grayish, bruising
or aging darker.
Edibility: Inedible.
Comments: Compare to Bjerkandera fumosa. Caps of
Bjerkandera adusta are thinner and generally have a darker
pore surface.

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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
Volk.

Figure 4. The upper tan surface of Bjerkandera adusta
and 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.