| 11. | Even when tracheids do take a structural role, they are supported by sclerenchymatic tissue.
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| 12. | The xylem of " Amborella " contains only tracheids; vessel elements are absent.
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| 13. | By the middle Devonian, the tracheid diameter of some plant lineages ( Zosterophyllophytes ) had plateaued.
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| 14. | Growing to height also employed another trait of tracheids the support offered by their lignified walls.
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| 15. | Finally, the latewood tracheids are formed, with small radial sizes and greater cell wall thickness.
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| 16. | The strand of conducting tissue contains simple tracheids, making this a vascular plant ( tracheophyte ).
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| 17. | The two major functions that tracheids may fulfill are contributing to the transport system and providing structural support.
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| 18. | There are two kinds of cell which are involved in the actual transport : tracheids and vessel elements.
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| 19. | The structure of softwood is fairly uniform, with only two types of cells : tracheids and parenchyma cells.
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| 20. | Defunct tracheids were retained to form a strong, woody stem, produced in most instances by a secondary xylem.
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