Fig. 10.3-15. Transverse section of yucca leaf (Yucca). Arrows indicate three depressions in the upper surface of this leaf of a desert-adapted monocot. The leaves are long and very thick, and the depressions run as channels along the surface. Between the channels are masses of fibers; typically, an epidermis lacks stomata anywhere that there are fibers immediately below it, and that is true here. There is parenchyma on either side of the channels, and all stomata are located in those channels. See following figure for a magnification of a channel.