Figs. 19 - 22. Light and fluorescence micrographs of peach tissues wounded (Fig. 21) or inoculated with L. persoonii (Figs. 19,20,22). Fig. 19. Longitudinal section through a portion of colonized bark showing relative position of polysaccharide-rich zone (AYZ), ligno-suberized tissue (IT), and newly generated phellogen (PG). Note hyphae (arrow) and small callus lip (C). x560. Fig. 20. Longitudinal section through bark and lateral bud (B) showing location of polysaccharide-rich zone (AYZ and small arrows), and dedifferentiating tissue leading to generation of ligno-suberized tissue and new phellogen (large arrows). x180. Fig. 21. Transverse section of bark tissue stained with phosphine and examined under ultraviolet excitation, showing differentiated phellem (PH) and cells of the ligno-suberized zone (IT, its internal boundary delimited by arrows). x800. Fig. 22. Transverse section of a portion of the ligno-suberized boundary zone and new periderm (NP) adjacent to peach bark tissue colonized by L. persoonii (from right) showing altered phellem cell shape (arrows). Note contrast between altered tissues in this figure and normal periderm in the previous figure. x800. (Figs. 19 - 21 from Biggs, 1984; Fig. 22 from Biggs 1986).