In most conifers micropyle sealing is followed, but less rapidly, with enclosure of the developing embryo and seed by enlargement of cone scales, or other tissues, so that plants now become angiospermous
Thin porous membranes in end walls of tracheids--and then vessels--may be the angiospermous
compensation for lack of the margo spaces that conifers have.
About 250 fossil pollen types related to 113 extant angiospermous
families from the Cretaceous and the Tertiary in China are discussed in
The Caytoniales: A new group of angiospermous
plants from the Jurassic rocks of Yorkshire.
ever-increasing case studies of apomixis in the angiospermous