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The Sycamore bark as it it gets old develops a rougher bark. As you look up an older tree such as the one in the Arboertum the bark is smoother as you go up the tree.
Courtesy of USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 242.