Burl on a sessile oak (Quercus petraea)

Burl on a sessile oak (Quercus petraea)

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: The bole of a sessile, or durmast, oak tree (Quercus petraea) showing the development of a large vegetative outgrowth or "burl". The tree is growing on a hillside in Cumbria, UK. The burl is about 2m from ground level and 70cm in diameter. The bark on its lower surface is unusually coarse and corky in texture. Burl wood is prized by woodturners, and for veneers, due to its complex and beautiful grain patterns. The cause of the reaction that produces a burl is usually unknown; possible sources include injury in the form of mechanical damage or attack by insects or fungi.

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Keywords: bark, biological, biology, bole, botanical, botany, burl, burl wood, durmast oak, flora, nature, oak tree, plant, quercus petraea, sessile oak, tree, veneer, wood grain, woodturner

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