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Gymnosperm Stem: Medullary Rays Three Year Pinus - Cross Section: Pinus Stem Magnification: 100x Because Of The Greater Production Of Xylem, The Vascular Cylinder Is Dominated By Radially Arranged Rays Of Secondary Xylem Interspaced With Medullary Rays Of Parenchyma Cells. Conspicuous Resin Ducts Are Present Throughout The Xylem. Photo
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