DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Lily flower ovary. Light micrograph of a section through an ovule (ovary) from a lily (Lilium sp.) flower, showing the embryo sac (oval, centre left). In the centre of the ovary is the placenta (hook-shaped). The wall surrounding the embryo sac is known as the integument. Magnification: x37 when printed 10 centimetres wide.
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