Section through heartwood of elm tree

Section through heartwood of elm tree

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Credit: ADAM HART-DAVIS/SCIENCE PHOTO LIBRARY

Caption: Cross-section through the heartwood of an elm tree, Ulmus sp., showing the annual growth rings. The heartwood occupies the central core of a mature tree & is surrounded by a layer of sapwood. The sapwood is saturated with water and forms the tree's conducting tissue, whereas the heartwood is a completely lifeless, dry tissue which functions only as a structural support.

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Keywords: botany, elm, elm tree, growth ring, hardwood, heartwood, nature, plant, plants, sap wood, trunk, ulmus sp., x-section, x-section of trunk

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