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Axisymmetric tree buckles

From:
http://arbtalk.co.uk/forum/fungi-pictures/21371-body-language-decay-delights-d-19.html

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Relative to this image, the blogger writes:
"This oak shows multiple buckle failures ( compression failures) the number of buckles and thier form tells us this is more than just a structural symptm, a symptom of internal decay, and in oaks this may be brown or white rot, as brown rot can and frequently does result in buckles due to a type of structural fault known as shell buckling."

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