DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Himalayan cedar (Cedrus deodara) leaf. Light micrograph of a section through a needle (leaf) from a Himalayan cedar tree, showing its thick cuticle and thick-walled epidermis (red) and hypodermis (subcutaneous tissue, red). Stomata (pores) and guard cells can also be seen, along with chloroplasts, and mesophyll tissue composed of parenchyma cells (blue-red). The vascular tissue is composed of xylem tracheid cells (red) and phloem sieve tube cells (blue). Magnification: x37 when printed 10 centimetres wide.
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