Unidentified mushroom

Unidentified mushroom

Observation - Unidentified mushroom - UK and Ireland. Description: Spotted this in an open field, no trees around. I really have no idea what this one could be looking through the guide book I have. Thought it could be a bonnet or fibrecap but I guess it could be many things - any help appreciated

Spotted this in an open field, no trees around. I really have no idea what this one could be looking through the guide book I have.
Thought it could be a bonnet or fibrecap but I guess it could be many things - any help appreciated