Mosses are bryophytes and they can reproduce both sexually and asexually. Mosses can be monoecious or dioecious. They depend on moisture to produce sexually. MOsses reproduce by spores which are analogous to the flowering plants. Moss spores are single-celled. Spores are housed in the brown capsule that sits on the seta. As the spores get ripen they get dispersed from the capsules. Water is a very important factor for their fertilization. As the sperm become mature, they have to swim to the eggs to fertilize them. The fertilized egg then produces the brown capsule.
Mosses can produce asexually also. They send new shoots in the spring from last years plant as well as fragmentation.