Panellus stipticus

Scientific name: Panellus stipticus (Bulliard:Fries) Karsten
Derivation of name: Styptic- means "astringent." Stypticus
is a variant spelling of stipticus. This mushroom is reputed to
have value in stopping bleeding. 
Synonyms:  Panus stipticus
Common name(s):  Luminescent Panellus; Bitter oyster.
Phylum:   Basidiomycota
Order:   Agaricales
Family:   Tricholomataceae
Occurrence on wood substrate:  Saprobic; grouped on
logs, stumps, and branches of deciduous wood; May
through December.  
Dimensions:  Caps are 1-3 cm wide; stipes 0.5-1.5 cm
long and 0.3-1 cm thick   
Cap:  Dingy white to pale brownish or orangish-buff; dry;
hairy to scurfy or minutely scaly.     
Gills: Attached to subdecurrent; pinkish-brown.
Spore print: White.
Stipe: Whitish to brownish; hairy; lateral to eccentric; may
be absent.
Veil: Absent.
Edibility: Inedible.
Comments:  The gills of this mushroom are bioluminescent.

More information at RogersMushrooms.com:   


Figure 1. Groups of luminescent panellus on a log.
Photo © Gary Emberger.
   

Figure 2. Note the lateral to off-center (eccentric) stipes.
The cap margins of some specimens are lobed.
Photo © Gary Emberger.

Figure 3. Caps of Panellus stipticus are convex with an
incurved margin at first. In outline, they are often semicircular
to kidney-shaped or shell-shaped. Photo © William Roody.

Figure 4. Because the gills are brownish, Panellus stipticus
can be confused with species of Crepidotus. Crepidotus
has brown spores whereas Panellus spores are white.
Photo © Noah Siegel.

Figure 5. The greenish bioluminescence of the gills can be
observed if the specimens are taken into a very dark room
and you give your eyes a few minutes to adjust.
Photo © R. Al Simpson.