Lentinellus omphalodes

Scientific name:  Lentinellus omphalodes (Fries) Karsten
Derivation of name: Omphal- means "navel" (umbilicus)
perhaps referring to the depressed center of the cap. 
Synonyms:  
Common name(s):  Stalked Lentinellus.
Phylum:   Basidiomycota
Order:   Russulales
Family:   Auriscalpiaceae
Occurrence on wood substrate:  Saprobic; solitary or in
small groups on deciduous or coniferous wood or on moss-
covered ground; August through November.  
Dimensions:  Caps 2.5-5 cm wide; stipes 0.5-5 cm long and
0.5-4 mm thick.   
Cap: Smooth; pinkish to brownish, darkening brown;
developing a depressed center in age.        
Gills: Attached to decurrent; edges toothed and torn;
whitish to tinged pinkish-brown.
Spore print: Buff.
Stipe: Brownish overall; central to off-center; dry, smooth,
and ridged.
Veil: Absent.
Edibility: Inedible.
Comments: There are a number of other Lentinellus
species (e.g., Figure 4 shows Lentinellus cochleatus)
and all are too bitter to be edible. My keys include
only two of the more common and conspicuous species:
Lentinellus omphalodes and Lentinellus ursinus. The
presence of amyloid spores distinguishes Lentinellus
from the genus Lentinus.

More information at MushroomExpert.com: 


Figure 1. Note the nearly central stipes.
Photo © William Roody.

Figure 2. The navel-like depression in the center of the cap
of this specimen illustrates the omphalodes part of the
scientific name of this fungus. Photo © Steve Nelsen.

Figure 3. The attached gills have serrated edges typical of
the Lentinellus genus. Photo © Steve Nelsen.


Figure 4. This photograph of Lentinellus cochleatus
shows the clustered growth habit of this species with
several caps arising from stalks fused at their bases - a
trait not shared by L. omphalodes. In several other
respects, though, Lentinellus cochleatus resembles L.
omphalodes. This Photo © Steve Nelsen.