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cambiums

  • plural
    of cambium.
    cambium
    noun
    a layer of delicate meristematic tissue between the inner bark or phloem and the wood or xylem, which produces new phloem on the outside and new xylem on the inside in stems, roots, etc., originating all secondary growth in plants and forming the annual rings of wood.

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Despite their miraculous vascular cambiums, “it’s probable that even ginkgo trees may die from ‘natural causes,’” said Richard Dixon, one of the authors of January’s ginkgo paper.

From New York Times ● Jul. 27, 2020

If the sapwood is thin, and the bark is so thick as to put great obstacles in the way of the junction of the upper and lower cambiums, death may result—the tree is permanently ringed.

From Disease in Plants by H. Marshall Ward

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