The ontogeny of epiphyllous microsporangia Ginkgo indicated that the microsporophyll in Ginkgo is of phyllome origin.Possibly, the epiphyllous microsporangia is a peculiar chimera.

生小孢杏的个体发生，表杏的小孢有来源的质，生小孢杏可能是一种奇特的嵌合体。