A cross section through a Cork Oak ( Quercus suber ) bark burl or burr. Burls occur when an insect or mold creates stress in the tree through virus or fungus. The tree produces a growth of wood and bark that is severely contorted. These are prized for their patterns. Cork oak naturally has a thick coating of bark and so do the burls | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Chillmaid, Martyn F. |
Taille de l’image : | 5760 px × 3840 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |