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What is an antheridium?

What is an antheridium? Here are some definitions.

Noun
  1. (botany) An organ producing male gametes called antherozoids, found in some algae, ferns, and bryophytes.
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It is seldom that more than one antheridium applies itself to an oogonium.
These particles become globose cells, grouped in the centre of the antheridium.
At maturity, the antheridium bursts releasing the sperm cells or antherozoids.
The male plant has no definite stem, and consists of a single concave leaf protecting the antheridium.
When the male gametes, or antherozoids, are released by the rupture of the antheridium, they swim in a water film to the archegonia and effect fertilization.
When mature antheridia were watered, the opercular cell and crescent-shaped cell were shed, and 32 spermatozoids were released from each antheridium.

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