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An
efficient fluid conducting structure in most vascular plants. |
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A trachea is a
tube-like structure of the xylem that consists of a column of superposed
cylindrical dead
cells ( tracheids) whose end walls have
been totally degraded, resulting in a continuous tube
reinforced by rings and spirals of
cellulose fibrils thickened with
lignin.
Tracheids are found in all
vascular plants and are the only conducting
elements in gymnosperms and
ferns.
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