I believe the Ginkgo is the direct ancestor of the angiosperms. When you observe the sprouting of the ginkgo seed and the seed of an apricot you find they are the same. The ginkgo seed has dicotyledons but they usually remain in the seed case.
Notice how the root first comes out of the seed then the sprout develops shooting up between the two short stems to the cotyledons. This is exactly like the apricot cherry and plum. I have not observed other angiosperms but I assume many if not all are the same. Having cotyledons and the way they sprout like angiosperms leads me to believe ginkgo is the ancestor.
Topic by Tom P.