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What is an archegonium?

What is an archegonium? Here are some definitions.

Noun
  1. (botany) A multicellular reproductive structure that contains a large, non-motile gamete (egg cell), and within which an embryo will develop.
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When the sporophyte has developed all three regions, the seta elongates, pushing its way out of the archegonium and rupturing it.
An archegonium consists of neck cells and a large egg cell.
The young sporogonium is protected by a thick calyptra derived from the tissue of the thallus around the archegonium.
Although more than one archegonium may be fertilized, only one gives rise to a viable embryo.
In the club mosses the zygote divides in a plane at right angles to the axis of the archegonium.
The fertilized nucleus or germ-cell of the archegonium in Cryptogams, from which the new plant is directly developed.

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