Most seed orchard theory is based on the assumption that panmixis will occur and that selfing will not be a serious problem.

大多数关于种子园理论，是以假定能发生随机交配和自而不会成为重问题为依。

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.

要同型孢子蕨类孢子体可经由同配子体自交、异配子体交配两类配育系统或以无配生殖方式产生，异配子体交配又可分为异配子体自交和异配子体异交两种方式。