The ultrastructure of intercellular passageways in vessels of yellow poplar (Liriodendron tulipifera, L.) part I: Vessel pitting

Abstract

The newly matured intervessel pit membranes of yellow poplar contain distinct openings. With increasing age the membranes become progressively occluded with incrustations which obstruct the small openings. Openings were not detected in the vessel-to-ray parenchyma and vessel-to-fiber pit membranes at any age.