Small agaric on tree trunk

Small agaric on tree trunk

Observation - Small agaric on tree trunk. Description: A scattered group of this very small agaric growing in the moss on the trunk of a very large sweet chestnut in deep shade. Cap around 1cm across, stem 3-4cms. Ideas?

A scattered group of this very small agaric growing in the moss on the trunk of a very large sweet chestnut in deep shade. Cap around 1cm across, stem 3-4cms. Ideas?