DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Lily flower bud. Light micrograph of a section through an anther from a lily (Lilium sp.) flower bud, showing pollen cells (circles) dividing. The male stamens are arranged in two whorls of three, known as the androecium (not shown). The anthers, on the ends of the stamens, have four pollen sacs, within which the diploid sporophyte pollen grains are undergoing meiosis (cell division) to form the haploid gameteophyte. Magnification: x37 when printed 10 centimetres wide.
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