9BELL P R,JEFFREY G,DUCKETT F L S.Gametogenesis and fertilization in Pteridium[J].Botanical Journal of the Linnean Society,1976,73:47-78.
10FASCIATI R,SCHNELLER J,SCHNELLER J,JENNI V,ROOS U P.Fertilization in the fern Athyrium filix-femina.Ⅱ.ultrastructure[J].Cryptogamic Botany,1994,4(4):356-367.