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archegonium
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archegonium
archegonium The female reproductive organ, or archegonium, emerging from a thalloid liverwort.

archegonium

plant anatomy
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Also known as: archegonia, oogonia
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Related Topics:
perianth
gametangium
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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.

This article was most recently revised and updated by Amy Tikkanen.