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Fig.
7.4-4.
Transverse section of a needle leaf of pine. Pines and other conifers lack
vessels completely, so the xylem in this pine leaf must consist of tracheids,
not vessels. Notice that these tracheids are smaller
than the surrounding parenchyma (in the upper left corner) and not
much larger than the phloem cells at the bottom of the micrograph.
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