Ground tissue systems - woody dicot
WOODY DICOT STEMS: In primary growth, all cells of the procambium differentiate into primary vascular tissue. In plants with secondary growth, such as the case in woody dicots, some of the meristematic cells remain and form a contiguous ring of vascular cambium, which begins to produce secondary phloem outside, and secondary xylem inside. The yearly additions of secondary xylem are commonly called "growth rings". The cambium forms two systems of vascular tissue, one vertically up the axis, and the other horizontally across the axis (called a ray system). Inward from the cambium, xylem rays are produced. Outwardly and continuously, phloem rays are produced. Associated with the rays are gum ducts in dicots which contain resins, oils, gums, and mucilages.
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