A small Bonnet with a sticky campanulate cap; it is covered in a glutinous pellicle that can be peeled away. The cap colour is quite vriable from a pale olive-brown to yellowish-green or greyish; the gills are pale yellow to grey, and the long viscid stipe is pale yellowish-grey/green. 

Photograph from top down, in side view and from underneath to show gills and full length of stipe.  Note texture of cap, habitat and substrate.

woodlands and heathlands, on grassy or woody debris

Found in summer and autumn

Fairly frequent and widespread in Britain.

Occasional in Leicestershire and Rutland.

https://www.first-nature.com/fungi/mycena-epipterygia.php