DNA cytophotometry has been used to study the development of the female gametophyte ofGinkgo biloba.It has been found that, at the beginning of the cellular stage, a large part of the cell population of the gametophyte is not haploid as to DNA content. Namely, very few nuclei (about 5%) show IC DNA content (i.e.the content of an haploid cell in the presynthetic stage of the mitotic cycle), while about 50% show 2C DNA content, more than 40% 4C and the remaining 8C and higher contents.