DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Eucalyptus leaf. Light micrograph of a cross-section through the midrib of a eucalyptus (Eucalyptus globulus) leaf. This xerophytic (arid-adapted) leaf has a thick layer of cuticle made of wax with sunken stomata (green, lower edge) in order to reduce water loss. There are also large secretory (oil) cavities in the mesophyll (one seen as a large hole at upper right). Within the midrib is a vascular bundle (left) composed of xylem (red) and phloem (pale pink) vessels, which transport water and carbohydrates around the plant respectively. Magnification: x100 when printed at 10 centimetres wide.
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