Hi, I dont know much about your eucs, however I have seen trees that have had their genetics rearranged by scientists so that they twist around or grow fat and then go thin again on their trunks, perhaps this is a natural genetic modification by your eucs (technically this would be like a cancer). also it could be that the man made air poisons have caused the tree to mutate, I have seen this happen near industrial factories. I may be completely wrong,would have to examine tree first hand to help any further, As for your grafting this is a common occurance with many trees when the branches "fuse" together. I have seen different species fused together and the larger tree become a host for the smaller, natural grafting? or something from afar?
