Mycena -but which one?

Mycena -but which one?

Observation - Mycena -but which one? - UK and Ireland. Description: Solitary fungus found growing through lichen on a rotting branch, gills are distinctly greyish and fairly well spaced, cap dried very quickly from greyish brown to much darker grey. Spore print is white.

Solitary fungus found growing through lichen on a rotting branch, gills are distinctly greyish and fairly well spaced, cap dried very quickly from greyish brown to much darker grey. Spore print is white.