Between the xylem and phloem is a meristem called the vascular cambium. The parent cells of the vascular cambium produce both xylem and phloem. The primary components of vascular tissue are the xylem and phloem. Nonvascular land plants are embryophytes that lack the vascular tissues xylem and phloem. Auxin induces the formation and organization of phloem and xylem. Non-vascular plants are plants without a vascular system consisting of xylem and phloem. Stems have two pipe-like tissues called xylem and phloem. They are usually associated with the xylem and phloem of the vascular bundles. This tissue divides off cells that will become additional xylem and phloem. Many fern stems have phloem tissue on both sides of the xylem in cross-section. These bundles include both xylem and phloem, as well as supporting and protective cells. It is found in the area between xylem and phloem. The vascular cambium produces new layers of secondary xylem annually. "Erwinia amylovora" typically makes its entry into its host xylem or cortical parenchyma. First, the water moves into the mesophyll cells from the top of the xylem vessels.