Crepidotus spp.

Scientific names:  Crepidotus mollis (Fr.) Staude;
Crepidotus applanatus (Pers.) P. Kumm.
Derivation of name:  Moll- means "soft." Applanatus means
"flattened."
Synonyms:  
Common name(s):  Crepidotus applanatus is called the
Flat Crep; Crepidotus mollis is called the Jelly Crep.
Phylum:   Basidiomycota
Order:   Agaricales
Family:   Cortinariaceae
Occurrence on wood substrate:  Saprobic; clustered,
sometimes overlapping on decaying hardwoods (rarely
conifers); July through September.  
Dimensions:  See figure captions.   
Cap:  See figure captions.        
Gills: Radiating from point of attachment; gills at first white,
becoming brownish at maturity. 
Spore print: Brownish.
Stipe: Absent, attached to substrate by a short, hairy plug of
tissue.
Veil: None.
Edibility: Unknown.
Comments: Miller indicates the presence of over 100 species
of Crepidotus in North America sharing traits such as thin
flesh, convex to fan-shaped caps, being generally stalkless,
inhabiting wood, and having brownish spores. Most require
the use of a microscope to identify them.

More informationat MushroomExpert.com:

 
Figure 1. C. mollis. Caps are 1-8 cm wide; color is variable
from olive-brown to ochraceous whitish. Caps are covered
with dark brown fibrous scales. Flesh is gelatinous. Photo ©
William Roody.

Figure 2. C. applanatus. Caps are 1-4 cm wide; color is
white when young, becoming brownish with age. Caps are
hairless or minutely downy. Photo © John Plischke III.

Figure 3. Another view of Crepidotus mollis. Photo © John
Plischke III.