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.

摘要型孢蕨类的孢体可经由体自交、体交两类系统或以无殖的方式产，体交又可分为体自交和体交两种方式。