Tracheary element

Tracheary element [ Botany ]	Dictionary of botanic terminology - index of names

Cells of the xylem involved with water conduction. May be tracheids or vessel members.

Vascular plants have two kinds of Tracheary Elements: Tracheids & Vessel Members. Conifers have only tracheids. Woody angiosperms have also vessels.
I	TRACHEIDS - Elongated tapering, dead at functional maturity	Vessel member & tracheids
	Shape: very long Cell wall: : primary and secondary, lignified Contains pits but no perforations. Function: Xylem Chief water-conducting element in gymnosperms and lower vascular plants, also found in Angiosperm xylem.
II	VESSEL MEMBER - Elongated tapering (but generally shorter than tracheids), Dead at functional maturity.
	Shape: Vessels are composed of vessel members in series connected by perforation plates. Cell wall: primary and secondary, lignified. Function: Xylem Chief water-conducting element in Angiosperm xylem.

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