Section through wood of coast Redwood

Section through wood of coast Redwood

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Credit: SCIENCE PHOTO LIBRARY

Caption: Coast redwood wood. Polarised light micrograph (PLM) of a radial longitudinal section through wood of a coast redwood tree, Sequoia sempervirens. Here, running from top to bottom, empty thick-walled xylem tubes known as tracheids are seen, each formed from a single cell. Small round pits (or pores) occur in the walls of the tracheids. Tracheids comprise the non-living element of wood and function in the conduction of water up the stem, as well as giving mechanical support to the tree. The pits allow the sap to flow across from one xylem cell to another. Coast redwoods are among the tallest trees in the world. Magnification: x12.5 at 35mm size.

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Keywords: botany, coast, coast redwood tree, in tracheid, nature, pit, pits, plant, plants, redwood, redwood tree, sequoia sempervirens, stem, tracheid pits, type, wood, xylem, xylem pits, xylem vessel

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