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abrupt associated interior defects BARK DISTORTION bark surface Bird peck bole bump BURL CALLUS OVERGROWTH callus tissue caused by falling caused by wind CENTRAL FOREST EXPERIMENT circular cross-cut section damaged areas decay defect indicators Depth 3 inches elliptical end product EPICORMIC BRANCH Overgrown exposed exterior faint fibers FLUTE FOREST EXPERIMENT STATION Forest Products Technologist frost grader grading system gradually taper back healed height-to horizontal illus Indiana lightning limb stub log or tree logging equipment Minnesota normal bark pattern normal contour NORTH CENTRAL FOREST occluded OPEN SEAM OPEN WOUND OVERGROWN KNOT OVERGROWN SEAM overgrown with bark overgrown with callus OVERGROWN WOUND peck holes photographs pith primary limbs protrude radius ratio ratio of less seams are vertical stem sugar maple surface rise tissue or wood tree or log tree surface U.S.D.A. Forest Serv UNSOUND usually sound vertical radial separations View of cross-cut wood and bark woody wounds are damaged