xylem fiber cell fiber tracheid A xylem fiber cell (PO:0000274) with bordered pits with pit cavities. plant_anatomy Fiber tracheids generally have pointed ends and bordered pits that have lenticular to slit-like apertures. If both libriform fiber cells (PO:0004520) and fiber tracheids are present, the libriform fiber cells usually have thicker walls. Fiber tracheids have bordered pits with smaller pit cavities than the vessel members (PO:0002003) or tracheids (PO:0000301) of the same wood and a distinct pit cavity leading to the cell lumen through the cell wall. PO_GIT:443 fibrotraqueida (Spanish, exact) fiber tracheid cell (exact) PO:0000355 繊維仮導管 (Japanese, exact)