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Old 05-04-2013, 11:04 AM   #693
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Joined: Jul 2007
Location: On the road to Shambala...
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Originally Posted by WayneJ View Post
That is a burl.

A burl results from a tree undergoing some form of stress. It may be caused by an injury, virus or fungus.

The above and more info can be found on this wikipedia page.

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