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Archegonium, the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base—the venter—which contains the egg. Neck-canal cells, located above the egg, disappear as the archegonium matures, thus producing a passage for entry of the sperm. The sperm are produced in the corresponding male reproductive organ, the antheridium.



Read more: https://study.com/academy/lesson/antheridium-definition-function.html


https://www.britannica.com/science/archegonium


https://study.com/academy/lesson/archegonium-antheridium-definition-function.html