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Development of intraxylary phloem in the stem of Combretum Rotundifolium (Combretaceae)

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The present study focuses on the origin, secondary growth, and anatomical characteristics of the intraxylary phloem compared to the regular phloem in Combretum rotundifolium Rich. The intraxylary phloem first originates in the primary stem from the perimedullary procambium and, later, from the internal cambium that develops by differentiation of the perimedullary procambium and dedifferentiation of perimedullary parenchyma cells. Tangential sclerenchyma bands, irregular stratification of the cellular elements, and uniseriate rays are present in the regular phloem, but not in the intraxylary phloem. We are the first to report the presence of an unusual bidirectional internal cambium that produces parenchymatous cells centrifugally and intraxylary phloem centripetally.


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