In bryophytes, sex organs are produced in the gametophyte. Bryophytes are non-vascular plants that include mosses, liverworts, and hornworts. The gametophyte is the dominant phase of the bryophyte life cycle, and it produces male and female sex organs called antheridia and archegonia, respectively.
Antheridia produce male gametes called sperm, while archegonia produce female gametes called eggs. Fertilization occurs when sperm swim through water to reach the archegonia and fertilize the eggs, leading to the production of a sporophyte.
The sporophyte is the diploid phase of the life cycle, and it grows out of the gametophyte. It produces spores through meiosis, which are dispersed to new locations to begin new gametophyte generations.