Figure 4.

Schematic drawings of intact and damaged leaves. (a) Juvenile leaf, (b) adult leaf, (c) transversal or longitudinal cut, (d) ring incision. Illustration of self-sealing (c,d) represents low relative humidity conditions with the arrows indicating the closure of the fissure due to leaf bending (c) or leaf contraction (d). (ep) epidermis with window cells, (ch) chlorenchyma, (nvb) net of peripheral vascular bundles, (pa) parenchyma, (cvb) central vascular bundle. Examples of parenchymatous cells are illustrated.