Some friends had a dead burr oak tree that was covered with knobs and burrs. Of course they called them burls which they are not if indeed a burls must contain eyes. These seem to be layers of growth over and around branches. As such they aren't very stable and will come apart easily.
Does anyone know of a reference explaining and naming different burls, burrs and/or other tree growths?
Does anyone know of a reference explaining and naming different burls, burrs and/or other tree growths?