Part of the stem observed with the objective of 10x. We can notice the cortex, surrounded by the periderm, part of the vascular cylinder (containing phloem and xylem, separated by the cambium (yellow), and the medullar parenchyma. The phloem bundles are separated by large parenchyma rays. In the cortex is visible a zone of subepidermal collenchyma, characterized by the greater thickness of the cell walls. Forming part of the phloem are located groups of sclereids and sclerenchyma fibers, differentiable by the different thickness of the lignified cell walls