What is the function of cypress tumor?

Tree tumor is also called eucalyptus. For the collection, its value lies not in the material, but in the shape of the tree tumor. The materials of tree tumors are generally rosewood, chicken wing wood, camphor wood, rhododendron and so on. Phellodendron amurense is mainly a medicinal material, and the tree tumor at the root is valuable if its shape is complete and its shape is unique.