Vessels - Conifers have tracheids. Woody angiosperms have vessels. Vessels are made from a xylem cell type called a xylem vessel member. Vessel members are a specific cell type found in the xylem. Vessels are vertically aligned tubes or "pipes" made up of many dead cells that transport liquids in xylem. Vessels are found in Angiosperms - plants that have covered seeds such as oaks and maples. Vessels begin as single living cells that join at their top and bottom to form a short conduit. Other vessel conduits connect from the sides to form a transport pathway from root tips to leaf tips. The newly formed vessels do not become functional until the end walls or septa between the vessel cells rupture. Vessels curve and join with other vessels as seen in a longitudinal view. Vessels do end. Live oaks have vessel patterns that are similar to those in latewood of other oaks. Live oaks have very broad rays. Ring porous, diffuse porous and simi-diffuse porous trees have vessels. More words on vessels.
Text & Graphics Copyright © 2007 Keslick & Son Modern Arboriculture
Please report web site problems, comments and words of interest, not found.