5x50 Fungus

Today is the start of my 5x50 challenge for Comic Relief, walk, run, cycle or swim 5 km every day for 50 days. We all went for a lovely walk along the first part of the West Highland Way, from home to the Beech Tree Hotel at Dumgoyne (9miles or 15 km). I had spotted this tree when we were up here a few days ago but I didn't have a camera. We have no idea what type of fungus this is but it covered the tree.