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The vascular tissue of a root or stem, consisting of a xylem, phloem pericycle, and sometimes having pith and medullary rays. Morphologically, steles can be divided into 2 main categories: protostele and siphonostele, the latter possessing a pith. Either type may be a single vascular vessel (monostele) or divided into several strands (dictyostele).

Subjects: Plant Sciences and Forestry.

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