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Walnut bark

Walnut bark

B720/0240

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Credit

DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY

Caption

Walnut bark. Cross section through the trunk of a walnut tree (Juglans regia) revealing the pattern in its bark. This pattern is known as a rhytidome. The rhytidome is composed of alternate layers of cork cells and dead cortical cells. Cork cells are produced in the stem by a layer of meristemetic cells (phellogen). Trees usually have one layer of phellogen, but in walnut there are several, which causes the pattern seen here.

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