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What (who) is nucellus - definition
![Models of different ovules, [[Botanical Museum Greifswald]]](https://commons.wikimedia.org/wiki/Special:FilePath/Modellreihe von Grundformen der Samenanlagen -Brendel Nr. 164-166-.jpg?width=200 "Models of different ovules, [[Botanical Museum Greifswald]]")
![Ovule structure (anatropous) 1: nucellus 2: [[chalaza]] 3: funiculus 4: raphe](https://commons.wikimedia.org/wiki/Special:FilePath/Ovule morphology anatropous.png?width=200 "Ovule structure (anatropous) 1: nucellus 2: [[chalaza]] 3: funiculus 4: raphe")
Wikipedia
In seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: the integument, forming its outer layer, the nucellus (or remnant of the megasporangium), and the female gametophyte (formed from a haploid megaspore) in its center. The female gametophyte — specifically termed a megagametophyte— is also called the embryo sac in angiosperms. The megagametophyte produces an egg cell for the purpose of fertilization. The ovule is a small structure present in the ovary. It is attached to the placenta by a stalk called a funicle. The funicle provides nourishment to the ovule.
