USDA / SCIENCE PHOTO LIBRARY USDA / SCIENCE PHOTO LIBRARY
Scanning electron micrograph of bordered pits lining the cell wall of a tracheid, a cell in the xylem, the supporting and water-conducting tissue of vascular plants. Pits allow movement of water from the tracheids to other tissues. Magnification=450x. Photo by Ken Eward.
Model release not required. Property release not required.