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| Keywords: The Oak (Marshall Ward) Fig 12.jpg en Fig 12 ”Transverse section of young stem showing primary vascular bundles etc highly magnified a and h the pith; c primary cortex; i epidermis; h periderm cork ; g collenchyma Two complete primary vascular bundles and parts of two others are shown separated by the primary medullary rays r spiral vessels protoxylem ; k bast-fibers protophloëm ; n m cambium separating the phloëm from the xylem; p wood-parenchyma Secondary medullary rays are seen in the bundles as also are pitted vessels of different sizes Th Hartig 1892 The Oak A Popular Introduction to Forest-Botany H Marshall Ward PD-old-100 The Oak Marshall Ward | ||||
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