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In a vascular plant, the stele is the central part of the root or stem containing the tissues derived from the procambium. These include vascular tissue, in some cases ground tissue and a pericycle, which, if present, defines the outermost boundary of the stele. These include vascular tissue, in some cases ground tissue (pith) and a pericycle, which, if present, defines the outermost boundary of the stele.The stele consists of three tissues: the pericycle, the xylem, and the phloem. Outside the stele lies the endodermis, which is the innermost cell layer of the cortex.