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Growth rings of a wych elm tree George Bernard:

Growth rings of a wych elm tree

» Description

Growth rings. Cross-section through the trunk of a wych elm tree (Ulmus glabra) showing the annular growth rings. A years growth consists of a porous band (dark brown), which is the slow winter growth, and a more dense band (light brown), which is the faster summer growth. (KEYSTONE/SCIENCE PHOTO LIBRARY/GEORGE BERNARD/SCIENCE PHOTO LIBRARY)
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