USDA / SCIENCE PHOTO LIBRARY USDA / SCIENCE PHOTO LIBRARY
Scanning electron micrograph of the xylem, the supporting and water-conducting tissue of vascular plants, of a redwood, showing the interiors of three tracheids, cells in the xylem. The cell walls are lined with bordered and simple pits, which allow movement of water from the tracheids to other tissues. Magnification=130x. Photo by Ken Eward.
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