Alternation of generations Antheridia Diploid Nonvascular plants in the domain Angiosperms Prokarya Seedless vascular Gametes Drgans Green algae Sporophyte Eukarya believed to have Gymnosperms Ferns Mycorrhizae Archegonia Drgan systems has a unique Plant kingdom Eggs Filamentous Haploid Aquatic ancestor Cell walls Gametophyte which varies Symbiotic Coelom between evolved from which also gave rise to with reproductive structures called plants.