How do homosporous lower vascular plants reproduce?

Homosporous lower vascular plants reproduce through an alternation of generations between a dominant, asexual sporophyte and a free-living, sexual gametophyte.123

The process follows these key stages:

• Spore Production: The mature sporophyte produces identical spores within structures called sporangia. Through meiosis, the chromosome number is reduced by half in these spores.143
• Gametophyte Development: These spores are released and germinate into small, independent, and typically bisexual gametophytes (prothallia) that bear both male and female sex organs.124
• Fertilization: The male organs (antheridia) release motile, flagellated sperm that require a film of water to swim to the female organs (archegonia), which each contain a single egg.124
• Sporophyte Formation: The fusion of sperm and egg (syngamy) creates a diploid zygote. This zygote divides to form an embryo, which eventually develops into the mature, dominant sporophyte plant.143

To prevent inbreeding, these plants often employ mechanisms such as maturing their sex organs at different times.4