DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Scots pine (Pinus sylvestris) female cone. Light micrograph of a section through a female cone from a Scot's pine tree, showing the woody ovuliferous scales (red) and bract scales (green). Two ovules are produced side by side on the upper surface of the ovuliferous scale. Each arises as a group of cells that forms a rounded hump of tissue called the nucellus (purple-blue). Magnification: x3 when printed 10 centimetres wide.
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