Fungus on birch

Fungus on birch

Observation - Fungus on birch - UK and Ireland. Description: About 5 cm across, hard to the touch. Growing on dead silver birch stump. Not sure of ID as book says this grows exclusively on ash.

About 5 cm across, hard to the touch. Growing on dead silver birch stump. Not sure of ID as book says this grows exclusively on ash.