Oak burr

Oak burr

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Oak burr on the trunk of an oak tree (Quercus robur). Burr (or burl) is deformed wood caused by cambium. Cambium is layers of tissue that are the source of cells for secondary growth. Burr can also be caused by continual cutting. Photographed in spring.

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Keywords: ancient, bark, biological, biology, botanical, botany, britain, british, bur, burl, burr, burrs, burs, cambium, close-up, deformed, deformity, detail, england, english, english oak, europe, european, flora, gnarled, horticultural, horticulture, nature, old, pattern, pedunculate oak, plant, plants, quercus robur, secondary growth, spring, tree, trunk, twisted, uk, united kingdom, vascular, wood

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