Woundwood  - Woundwood is a very tough, woody tissue that grows behind callus and replaces it in that position.  When woundwood closes wounds, then normal wood continues to form.  After wounding, callus forms first about the margins of the wound.  Woundwood forms later as the cells become lignified.  Callus is a tissue that is meristematic, low in lignin, and homogenous as to cell types. Woundwood is not meristematic, is high in lignin, and has differentiated cells -vessels, fibers, axial and radial parenchyma.  Woundwood is differentiated tissue that has lots of lignin. 
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(See A CLOSER LOOK AT TREES, SHIGO "video")


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