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== Definition ==
== Definition ==
=== Glossary of Plant Systematics (1st ed.) by [[Simpson_2006|Simpson (2006)]] ===
* The ancestral type of tracheary element that is imperforate, in which water and mineral nutrients flow between adjacent cells through the primary cell walls at pit-pairs.
=== Glossary of "Life (9th ed.)" by [[Sadava_Hillis_Heller_Berenbaum_2011|Sadava et al. (2011)]] ===
=== Glossary of "Life (9th ed.)" by [[Sadava_Hillis_Heller_Berenbaum_2011|Sadava et al. (2011)]] ===
* A type of tracheary element found in the [[xylem]] of nearly all vascular plants, characterized by tapering ends and walls that are pitted but not perforated. (Contrast with [[vessel_element|vessel element]].)
* A type of tracheary element found in the [[xylem]] of nearly all vascular plants, characterized by tapering ends and walls that are pitted but not perforated. (Contrast with [[vessel_element|vessel element]].)
=== Glossary of "The Evolution of Plants (2nd ed.)" by [[Willis_McElwain_2014|Willis & McElwain (2014)]] ===
=== Glossary of "The Evolution of Plants (2nd ed.)" by [[Willis_McElwain_2014|Willis & McElwain (2014)]] ===
* Elongated water-conducting cells.
* Elongated water-conducting cells.