Sporophyte generation
The sporophyte generation is the dominant generation in Lycopodium. It produces spores that can disperse and grow into new gametophytes. The sporophyte consists of a stem with leaves and roots. The leaves are small and scale-like, and the roots are adventitious. The stem is usually unbranched, but it can be branched in some species. The sporangia are borne on the upper surface of the leaves.
Gametophyte generation
The gametophyte generation is the sexual generation in Lycopodium. It produces gametes that can fuse to form a zygote, which can develop into a new sporophyte. The gametophyte is small and independent, and it can be either male or female. The male gametophyte produces sperm, while the female gametophyte produces eggs.
Fertilization
Fertilization occurs when a sperm from a male gametophyte fertilizes an egg from a female gametophyte. The zygote develops into a new sporophyte, which begins the cycle again.
Ecological roles of Lycopodium
Lycopodium is an important component of many terrestrial ecosystems. It provides food and shelter for animals, and it helps to stabilize the soil. Lycopodium is also used as a traditional medicine and as a source of ornamental plants.