Talk about diplobiontic monogenic cycle

When the cycle encompasses a single generation of organisms whose cells are diploid. Organisms produce sex cells that are haploid, and each of these gametes must combine with another gamete in order to obtain the double set of chromosomes necessary to grow into a complete organism, the sporophyte. Meiosis occurs only during the formation of gametes and the gametes undergo no further cell division (by mitosis) until fertilization occurs. In the whole cycle, gametes are the only haploid cells. The diploid multicellular individual is a diplont; this is the case of some brown algae, e.g. Fucus.