Observa tion on Ultra structure of Sclerotesta and Endotesta from NormalSeeds and Epiphyllous Seeds of Ginkgo biloba var. epiphylla Mak Comparative Studies on Morphology of Seeds of Ginkgo biloba var. epiphylla 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