What is transfusion tissue?
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The tissue immediately surrounding at least part of the vascular bundles in the leaves of gymno-sperms, e.g. Pinus. Transfusion tissue is composed of tracheids (transfusion tracheids) with conspicuous *bordered pits , and parenchyma cells (transfusion parenchyma) containing tannin-like substances and sometimes starch. The main function of the transfusion tissue is believed to be the transport of materials between the vascular bundles and the mesophyll.
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