作 者 ：Ma Feng-Shan, Li Jian-Xiu
期 刊 ：植物分类学报 1991年 2期
关键词：银杏叶生胚珠；
Keywords:Ginkgo biloba, ovuliferous leaf,
Abstract:
This paper reports the occurrence of the ovuliferous leaves on a Maidenhair tree
(Ginkgo biloba)growing in Longdong, Yiyuan County, Shandong Province. This phenome-
non is discussed in connection with the history of Ginkgoales. It is believed that this discovery
serves as an illustration of the hypothesis that the secondary apical position of ovules
(Ginkgoales) is a modification of the marginal position (Pteridospermidae). Again, it proba-
bly leads to the assumption that, in Ginkgo, “the foliage leaves” bear some features of “the
sporophylls” and they are derived from telomes.