Tracheids  - Conifers have tracheids.  Woody angiosperms have vessels.  Tracheids are dead, single-celled transport "pipes" for liquids in xylem.  Tracheids are found in Gymnosperms - plants that have naked or uncovered seeds such as conifers.  Tracheids are enlarged parenchyma cells. 
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(see "Plugging in Wall 1")

More words on vessels.

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