The sexual stage, called the gametophyte generation, produces gametes, or sex cells, and the abiogenetic stage, or sporophyte age, produces spores abiogenetically
As far as chromosomes, the gametophyte is haploid (has a solitary arrangement of chromosomes), and the sporophyte is diploid (has a double set)
All aquatic plants have alternation of generations. In mosses and their family members (Bryophytes), the haploid gametophyte is the predominant age, and the diploid sporophytes are sporangium-bearing stalks developing from the gametophytes