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

大多数关于种园理论，是以假定能发交配和自花受精而不会成为重问题为依据的。

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.

摘要同型孢的孢体可经由同配体自交、异配体交配两配育系统或以无配殖的方式产，异配体交配又可分为异配体自交和异配体异交两种方式。