SIDNEY MOULDS / SCIENCE PHOTO LIBRARY SIDNEY MOULDS / SCIENCE PHOTO LIBRARY
Light micrograph of a vertical section through a lime tree (Tilia sp.) stem, showing secondary xylem. Two different types of cell are visible in this image; elongated tracheary cells, which conduct sap from the roots to the leaves, and small polygonal cells which make up the tree's vascular ray system. The rays supply the xylem tissue with nutrients. The speckled appearance of some of the tracheary cells is due to the presence of numerous tiny pores in the cell walls. These pores (known as pits) allow the exchange of substances between adjacent cells. Magnification: x50 at 35mm size.
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