DeskribapenaHerbaceoaus Dicot Stem Xylem Vessels in Older Richinus (35474133884).jpg
cross section: Richinus stem
magnification: 400x
Xylem is endarch with protoxylem found towards center of stem and younger metaxylem towards the periphery of the stem. Phloem is endarch but modest annual growth makes it difficult to distinguish between the older protophloem at the periphery and younger metapholem to the center of the stem.
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