Fig. 18. Transverse sections of peach bark examined with transmission electron microscopy (bar = 1 micron). Fig. 18 shows a portion of boundary zone cell 8 days postwounding with suberin lining (S) adjacent to a nonsuberized cell (NSC). Plasmodesmatal canals (P) in shared cell wall (CW) appear more electron dense than suberin. Suberin appears only slightly lamellate and is relatively electron lucid.