Homosporous ferns produce sporophytes by intra gametophytic selfing, inter gametophytic mating, or apogamy.Gametangium ontogeny, genetic load, and ploidy affect the mating system of each species.

摘要同型的体可经由同体自交、异体交两系统或以无生殖的方式产生，异体交又可分为异体自交和异体异交两种方式。