We were up in the Scottish hills this morning where a number of trees have been cut down (to allow others more space to grow we think). We noticed this strange wooden-like growth (shaped like a toilet seat) growing around the top of the tree stump. Appropriately brown! We’re not quite sure what causes this growth. It is solid and is not some kind of fungus. We noticed the ‘toilet seat’ on several tree stumps. What are these growths? That question has got us stumped too. Anyone know the answer?