en :
fr :
Going inwards the ovule is made of:
Two integuments, the outer one being vascular. At the ovule apex, there is a tiny opening in integuments called micropyle.
The nucellus is a diploid parenchymatous tissue, surrounded by integuments and containing the embryo sac. If the nucellus is thin, the ovule is tenuinucellate; if it is thick, it is crassinucellate.
The embryo sac, the female gametophyte, is made of 8 haploids cells.

APG II (Angiosperm Phylogeny Group) (10 galeries photos)
Album Herborisation
Orchidées (Orchidaceae, Asparagales, Monocots)
Fruits complexes
Fruits multiples