1. Stem transverse section: cork (ck), cortex (c), scalloped ring of fibers (f), sclereids (scl), secondary phloem (sp), vascular cambium (cam), secondary xylem (sx) with large vessels (v), medullary ray (mr), and pith (p) of thickened cells to the exterior and thin-walled cells in the center.

2. Cork (top) and primary cortex of thickened parenchyma, both with scattered prisms (ts).

3. Vascular cambial area showing sclereids, some containing prisms, projecting into a medullary ray between regions of secondary phloem (white) and xylem (shaded) (ts).

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