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| Description: Perforated and pitted secondary walls of dead vessel member cells form these water-conducting tubes, which vary in size and in shape. B The thick secondary walls of dead xylem cells connect to make long, water-con-ducting tubes. Lignin deposited in rings or spirals strengthens the walls. Perforation plates impart strength to a junction where vessel members meet, while also allow-ing water to flow through the tube. The micrograph shows a perforation plate in a section of magnolia (Magnolia grandifolia). Pitted walls of tracheids are also visible. Picture Stats: Views: 625 Filesize: 393.79kB Height: 1021 Width: 1190 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=47883 |