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Concentric growths on Hornbeam bark

Observed: 8th April 2013 By: Paul RobertsPaul Roberts’s reputation in PlantsPaul Roberts’s reputation in PlantsPaul Roberts’s reputation in PlantsPaul Roberts’s reputation in Plants
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Description:

Large concentric rings of hard woody tissue in several places on this hornbeam coppice. Very grateful for any clues as to what causes this and whether we should be concerned.

Identifications
Species interactions

No interactions present.

Species with which European Hornbeam (Carpinus betulus) interacts