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

叶小孢子囊个体，小孢子叶有叶性来源性质，叶小孢子囊可能是一种奇特嵌合体。