Aspect of the epidermis and the cortex observed with the objective of 40x. We can distinguish externally the epidermis, formed by a layer of cells, on which appears a dark thick layer of suberin. Below it is located the exodermis, whose cells show red-stained (due to safranin) lignified walls. More internally are placed the cells of the cortical parenchyma (yellow), showing cellulose walls stained with Alcian blue