Small domed agaric with crinkly gills

Small domed agaric with crinkly gills

Observation - Small domed agaric with crinkly gills. Description: Emerging from rough turf under oak, this small 1cm cap on a long thin stem with distinctive crinkly gills. Any ideas?

Emerging from rough turf under oak, this small 1cm cap on a long thin stem with distinctive crinkly gills. Any ideas?