中文摘要：

对首次发现的我国第1株具叶生小孢子囊银杏的比较形态学进行了研究。结果表明：叶生小孢子囊银杏有正常小孢子囊和叶生小孢子囊两种类型，前者占98%，后者占2%。具有叶生小孢子囊的短枝，产生叶生小孢子囊的叶占19．9％。叶生小孢子囊常着生在短枝的叶片边缘，叶片明显较正常叶片小，在裂刻处堆积1～9个不等的小孢子囊或者小孢子囊1～3（5）个聚生在叶柄与叶片交界的叶柄两侧。叶生小孢子囊长和宽平均为0．95mm和0．48mm，每个小孢子囊有花粉1．86万粒，花粉长和宽分别为27．57μm和13．60μm。每个叶生小孢子叶球共有花粉6．43万粒。花粉粒具有萌发能力。利用长枝和短枝以及小孢子叶球和小孢子囊进行Q型聚类分析发现，3年和4年枝分为一类。

英文摘要：

Comparative morphology of the epiphyllous microsporangia in Ginkgo biloba L. firstly discovered in China were studied. There are normal microsporangia and epiphyllous microsporangia on the epiphyllous microsporangia Ginkgo, which accounted for 98% and 2%, respectively. The percentage of epiphyllous microsporangia leaf on the short shoot with epiphyllous microsporangia is 19.9%. The epiphyllous microsporangia often arise on the edges of leaves of short shoots. The leaves with epiphyllous microsporangia are obviously smaller than normal leaves in size. Usually 1 to 9 microsporangia cluster on the leaf lobes or about 1 to 3 （sometimes 5） microsporangia are born at the both sides of the petiole. The average length and width of the epiphyllous microsporangia are 4. 95mm and 0.48 mm respectively. Each microsporangia contains 18 600 pollen grains. The length and width of the pollen grain is 27.57 μm and 13.60 μm, respectively. There are 64 300 pollen grains in each epiphyllous microstrobilus. Their pollen grain has the ability of germination. Q-type clusters of long shoot and short shoot and microstrobilus and microsporangia show that three years old shoot and four years old shoot belong to one group. The essence of morphology, taxonomic status and genetic relationship of epiphyllous microsporangia Ginkgo were discussed. The finding of epiphyllous microsporangia Ginkgo was very important both to the protection and utilization of Ginkgo germplasm resources in China as well as the research on the essence of morphology of male reproductive organ in Ginkgo, taxonomic status and genetic relationship of Ginkgo.