Leotia viscosa

Scientific name:  Leotia viscosa Fries
Derivation of name:  Visc- means "sticky" (viscid) in reference
to the stickiness of the fungus when moist.
Synonyms:  
Common name(s):  Green-headed jelly club
Phylum:   Ascomycota
Order:   Leotiales
Family:   Leotiaceae
Occurrence on wood substrate:  Saprobic; in clusters on the
ground and well-decayed wood; July through September. 
Dimensions:  Green-headed jelly club may be up to 6.5 cm tall
with a well-defined head.   
Description:  The olive-green to dark green head is distinctive
together with the pale yellow to yellow-orange stalk.  These
fungi are rubbery or gelatinous in texture.      
Edibility:  Unknown.

More information at MushroomExpert.com:    

Figure 1. Although called jelly fungi, these organisms are
ascomycetes, forming asci and ascospores unlike the true
jelly fungi which are basidiomycetes.
Photo © Pam Kaminski.

Figure 2. Leotia viscosa collected during a foray.
Photo © Gary Emberger.