DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Scots pine (Pinus sylvestris) leaf. Light micrograph of a section through a needle (leaf) from a Scots pine tree, showing its thick cuticle and thick-walled epidermis and hypodermis (subcutaneous tissue). A stoma (pore, round, right) and guard cells (dark-red) can also be seen, along with chloroplasts, and mesophyll tissue composed of parenchyma cells (pink). Magnification: x37 when printed 10 centimetres wide.
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