Tapinella panuoides

Scientific name: Tapinella panuoides (Batsch) E.-J. Gilbert 
Derivation of name:  
Synonyms: Paxillus panuoides (Fr.) Fr.
Agaricus panuoides Fr.  
Common name(s):  Stalkless Paxillus.
Phylum:   Basidiomycota
Order:   Boletales
Family:   Tapinellaceae
Occurrence on wood substrate:  Saprobic; scattered or in
overlapping clusters on conifer logs, stumps, and timbers in
service (e.g., fenceposts); May through November.  
Dimensions:  Caps 2.5-10 cm wide.  
Cap: Olive-yellow to yellow-brown to orangish-brown; dry;
downy to smooth; margin incurved when young, becoming thin,
uplifted, and wavy at maturity.    
Gills: Yellowish; radiating from point of attachment; sometimes
forked, with cross veins, often wavy and corrugated near base
but sometimes straight; easily separated from cap.
Spore print:Yellowish to yellowish-brown.
Stipe: Absent (sometimes as short, lateral, stubby structure).
Veil: Absent.
Edibility: Poisonous.
Comments: Tapinella corrugata (Paxillus corrugatus) is
similar to this species. The gills often differ in color but the
potential exists for confusion. See Figures 5 and 6 and
consult Bessette for additional information.. Microscopic
analysis of spore size may be required to provide certainty
of identification. 

More information at MushroomExpert.com:

Figure 1. Grouping of Tapinella panuoides specimens on
woody conifer debris. Photo © William Roody.

Figure 2. Close-up of the specimen in Figure 1. Note the
wavy or corrugated gills particularly near the point
of attachment. Photo © William Roody.

Figure 3. Overlapping caps of Tapinella panuoides.
Photo © Steve Nelsen.

Figure 4. Additional specimen of stalkless Paxillus.
Photo © Steve Nelsen.

Figure 5. Tapinella corrugata. Photo © Steve Nelsen.

Figure 6. Tapinella corrugata. The gill color of this
species is described as more orange-yellow than the
gills of T. panuoides. Photo © Steve Nelsen.