DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Moss perichaetium. Light micrograph of a section through the perichaetium of a female moss (Mnium punctatum) plant, showing the archegonia (female reproductive organs) inside. The perichaetium is a bundle of modified leaves surrounding the archegonia. The archegonia produce the female gametes (ova, eggs) which fuse with the male antherozoids ('sperm') to ultimately form spores. Magnification: x37 when printed 10 centimetres wide.
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