HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Fern female reproductive organs. Light micrograph of a section through a mature fern prothallus, revealing the archegonia (female reproductive organs). The prothallus is the fern reproductive stage that develops from a spore. It contains both the male (antheridium) and female (archegonium) sex organs. Magnification: x280 when printed at 10 centimetres across.
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