中文摘要：

以来自沂源县、在中国首次发现的叶籽银杏为试材，对其叶的解剖结构及气孔特性进行研究。结果表明：正常叶片叶肉有栅栏组织和海绵组织的分化，而叶生拟胚珠叶片叶肉由同型薄壁细胞组成；叶片着生拟胚珠部位有脊状突起；突起处的叶肉由大型薄壁细胞构成，叶脉位置分叶脉在突起的两侧和叶脉在突起的正上方2种类型，而且其叶脉均较正常部位的叶脉密集。首次发现，叶生拟胚珠叶叶柄在紧贴韧皮部外侧的基本组织中存在3～4层木质化的细胞。叶籽银杏叶片气孔在上下表皮均有分布，其气孔器单环式；有些叶生拟胚珠叶片下表皮气孔沿叶脉排列成不规则的气孔行。对叶籽银杏与其他裸子植物和蕨类的亲缘关系进行探讨。

英文摘要：

The anatomical structure and stomatal characteristics on the leaf of Ginkgo biloba var. epiphylla found firstly in China from Yiyuan county of Shandong Province were studied in this paper. The results of analyses showed that the mesophyll of normal leaf blades had the differentiation of palisade tissue and spongy tissue, but the mesophyll of leaf blades with ovule-like organ was composed of the homeotypic parenchyma cells. There were ridges on the sites with ovule-like organ, and the mesophyll cells in ridges were composed of large parenchyma cells. The location of their veins was divided into two types, i.e. distributing at the both sides of the ridge and distributing just above the ridge. Moreover, the veins in ridges were denser than those of normal sites. Three to four layers lignified cells located at the lateral border of phloem,in the ground tissue of the petiole of the leaf with ovule-like organ,which was reported for the first time. The stomata of G. biloba var. epiphylla were amphistomatic,the stomatal apparatus was monocytic; and stomata in the lower epidermis of some leaf blades with ovule-like organ arranged irregularly in rows along the veins, The genetic relationships among G. biloba var. epiphylla,fern,and other gymnosperms were discussed.