'Sawdust' on dead cherry tree stump

'Sawdust' on dead cherry tree stump

Observation - 'Sawdust' on dead cherry tree stump - UK and Ireland. Description: Piles of fine sawdust have been accumulating down the trunk and at the base of an old dead cherry tree trunk. I would like to identify what is producing this.

Piles of fine "sawdust" have been accumulating down the trunk and at the base of an old dead cherry tree trunk. I would like to identify what is producing this.