Analysis on Karyotype and Its Evolutional Trend of Ginkgo biloba var. epiphylla Germplasms Resources Analysis on Karyotype and Its Evolutional Trend of Ginkgo biloba var. epiphylla Germplasms Resources Observa tion on Ultra structure of Sclerotesta and Endotesta from NormalSeeds and Epiphyllous Seeds of Ginkgo biloba var. epiphylla Mak Observa tion on Ultra structure of Sclerotesta and Endotesta from NormalSeeds and Epiphyllous Seeds of Ginkgo biloba var. epiphylla Mak Comparison on Starch Characters in Endosperm of Ginkgo biloba var. epiphylla Mak. and Its Systematic Significance Comparison on Starch Characters in Endosperm of Ginkgo biloba var. epiphylla Mak. and Its Systematic Significance