Medullary Bundles - Internal Anatomy

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Section by Sheila M. Hayden; photomicrograph by W. John Hayden; secondary phloem development (blue) in medullary bundles of moderately mature stem (below the inflorescence region).

Section by Sheila M. Hayden; photomicrograph by W. John Hayden; secondary xylem from medullary bundles filling the pith region of a mature late-season stem (below the inflorescence region).