1. Root transverse section: cork; thickened parenchyma; secondary phloem with sclereids, fibers, and medullary rays; secondary xylem with vessels, fibers, and medullary rays.

2. Cork showing alternating brown and light tangential layers (ts).

3. Root transverse section: parenchyma (lower left); secondary phloem with fibers, a medullary ray, and cluster crystals of calcium oxalate; vascular cambial line; secondary xylem (upper right) (polarized light, compensator first order).

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