PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Walnut tree bark. Close-up of the bark of the walnut tree (Juglans regia). Bark protects the inner parts of the tree from damage. This tree is native to southern Europe and east as far as the Himalayas. It is now cultivated throughout the warmer areas of the world for its nuts.
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