Figure 10

De-orientation of tracheids. A: Irregular and de-oriented tracheids (arrow), as seen in a tangential section of a healing upper margin B: Radial section of a column-like structure, showing the wound surface (arrowhead), the ventral zone with disordered tracheids and parenchymatous cells (asterisk) and normal, axially oriented xylem and phloem, (arrow), as well as the outer periderm. C: Series of axial tracheids (arrowhead) next to horizontally disposed tracheids (asterisk) and radius (arrow) in a cross section. D: Resin ducts tangentially oriented (arrows), as seen in a radial section of the upper margin.