(I took additional pics of the gills and stipe for reference, but were too many to upload here)
Gilled mushroom. Found growing out of a decomposing log and mosses in surrey urban acres
Cap shape -parabolic
Cap margin – even
Cap surface features – smooth
Partial veil features na
Attachment of gills – adnate
Breadth of gills – narrow
Gill spacing – subdistant to distant
Edges of gills – can’t tell from photo
Location of stem center
Shapes of stems – equal
Bulbs and volvas na
Stem surface smooth
ID – potentially a species of mycena, due to small size, shape of cap, and lack of a bump on the cap (it looks more bumpy in the pic than it was in real life).