Antheridium

Part of a plant producing and containing male gametes

Antheridium

An antheridium is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). The plural form is antheridia, and a structure containing one or more antheridia is called an androecium. Antheridia are present in the gametophyte phase of cryptogams like bryophytes and ferns.

From Wikipedia, under CC BY-SA. More on occurri.