Abstract
The walls of conifer tracheids tend to be thicker when they are adjacent to medullary rays. In most species the extent of thickening seems to be less in the late wood than in the early wood. Thickening tends to be more pronounced In older wood and in vigorous trees.
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LADELL, J. Ray Thickenings in the Walls of Conifer Tracheids. Nature 213, 470–473 (1967). https://doi.org/10.1038/213470a0
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DOI: https://doi.org/10.1038/213470a0
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