The life cycle of clubmosses alternates between a sporophyte stage (the familiar plant form) and a gametophyte stage (a small, independent plant). The sporophyte produces spores through meiosis, which then germinate into the gametophyte. The gametophyte produces egg and sperm cells, which unite to form a new sporophyte plant.
Clubmosses play a significant role in ecosystems as they provide habitat and food for various organisms. They also contribute to soil formation and nutrient cycling.