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Inhibition of archegonial maturation, when sperm are ready for release, would prevent fertilisation events (Longton 1972).
At the micropylar end of the seed, the megagametophyte (sometimes erroneously called endosperm) is covered by the brown, papery left over of the nucellus (perisperm) and forms a cap over the archegonial chamber and radicle (Fig.
The entire female gametophyte is coenocytic and there is no evidence of archegonial structure or differentiated egg cells [ILLUSTRATION FOR FIGURE 4B OMITTED].