This is the life cycle of Pteridophytes, vascular, non-flowering, non-seed producing plants. Their life cycle is very similar to the more primitive, non-vascular bryophytes, the mosses, liverworts, etc…with two primary differences: the Bryophytes dominant, photosynthetic stage is their haploid, gametophyte stage producing separate male and female gametophytes which then produce the sperm and egg cells which upon fertilization produce the diploid sporophyte. In Pteridophytes, ferns, the diploid sporophyte is the dominant form we recognize and the gametophyte is dioecious containing both sexes, producing both eggs and sperm from different organs.