Page 51 – Epidermal and hypodermal layers of the leaf
Fig. 44 . Epidermal and hypodermal layers of the leaf. A and B, transverse, and C and D, longitudinal (i.e., radial) sections, respectively, of the basal (i.e., non-chlorophyllaceous) region of a fully differentiated leaf to show the epidermal (ep), hypodermal (h, h₁ and h₂) and outermost of the ground parenchyma (gp) cell layers before the cell walls begin to thicken greatly. Notice the relative (radial) lengths of the cells in the various layers, in A and B, and the relative diameters, in C and D. The apparent double (longitudinal, i.e., radial) wall is really another section of this undulated wall. si. silica body in the epidermal cells. X400.