tracheid

/trey-kee-id/US // ˈtreɪ ki ɪd //UK // (ˈtreɪkɪɪd) //

气管,气管膜,管线,管胞

Definitions

n.名词 noun

1
Botany.
- : an elongated, tapering xylem cell having lignified, pitted, intact walls, adapted for conduction and support.Compare vessel.

As a rule buckling of a tracheid begins at the bordered pits which form places of least resistance in the walls.
One to two large, simple pits to each tracheid on the radial walls of the cells of the pith ray.
One or two large pits to each tracheid on the radial walls of each cell of the pith ray.