Tracheids

Tracheids and vessel elements
In vascular plants, the xylem is the tissue that carries water up the root and stem. In trees, it constitutes wood; the word is derived from Greek ξύλον xúlon, "wood, timber".
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tracheids Long, tapered cells with pitted walls that form a system of tubes in the xylem and carry water and solutes from the roots to the rest of the plant. One type of xylem cells.
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tracheids: the main conducting vessels of the xylem in most vascular plants.
tracheophytes: vascular plants composed of a xylem and phloem.
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Xylem also contains tracheids. These are individual cells tapered at each end so the tapered end of one cell overlaps that of the adjacent cell. Like xylem vessels, they have thick, lignified walls and, at maturity, no cytoplasm.
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In most plants, pitted tracheids function as the primary transport cells. The other type of tracheary element, besides the tracheid, is the vessel element. Vessel elements are joined by perforations into vessels.
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ring-porous wood Secondary xylem characterized by larger vessels and tracheids being produced early in the season (or following favorable growing conditions). Thus each term of growth activity is seen as a ring.
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secondary xylem
Tissue produced by vascular cambium and composed of both tracheids and vessel elements.
Covered in Lab 9 Seed Plant Sporophyte ...
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