Xylem and phloem tissues are involved in the conduction processes within plants. 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. The xylem typically lies adaxial with phloem positioned abaxial. Saps may be broadly divided into two types&colon; xylem sap and phloem sap. Only the outer handful of rings contain living tissue (the cambium, xylem, phloem, and sapwood). Stems have two pipe-like tissues called xylem and phloem. The transport itself happens in vascular tissue, which exists in two forms&colon; xylem and phloem. This tissue divides off cells that will become additional xylem and phloem. It is found in the area between xylem and phloem. The fibers of the xylem are always lignified, while those of the phloem are cellulosic. Sieve cell associated albuminous cells work between phloem and parenchyma. This causal agent attacks the phloem and cambium of oaks, allowing beetle and fungi infestation. Bark bread is a traditional food made with cambium (phloem) flour.