DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
African teak stem. Light micrograph of a section through the woody stem of an African teak (Pericopsis elata) plant, showing its diffuse-porous xylem tissue. The xylem vessels (large, circular), which carry most of the water, are scattered throughout the xylem tissue. The yellow thick-walled cells are fibres, and fibre tracheids. Medullary rays can also be seen (vertical, yellow). Magnification: x6 when printed 10 centimetres wide.
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