The below images show Rigidoporus ulmarius on horse chestnut – just. Without taking a very close look, it could easily be missed. This is an important thing to understand – if you don’t look at a tree thoroughly, you may miss something that could change your entire perception of the tree (and its associated management). Always look, and not simply from afar. This may be most pertinent on mature and veteran trees, and trees with significant target zones.