intra-

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.

摘要同型类的体可经由同体自交、体交两类系统或以无生殖的方式产生，体交又可分为体自交和体交两种方式。