Fig. 26. Transmission electron micrographs of transverse sections of the boundary zone and necrophylactic periderm of wounded peach bark. Bar = 1 micron.   Fig. 26 shows organelle-rich cytoplasm of a phellem cell of a necrophylactic periderm sampled 14 days postwounding. Note lignified primary wall (CW), suberized secondary walls (S), plasma membrane (PM), rough endoplasmic reticulum (RER), mitochondrion (M), dictyosome (D), and associated vesicles.