The connexion between the base of the ovule and the base of the nucellus is kept up by means of the raphe r.
In Araucaria and Saxegothaea the nucellus itself projects beyond the open micropyle and receives the pollen-grains direct.
The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore.
The base of the nucellus is indicated by the chalaza ch, while the apex is at the micropyle m.
The vessels of the cord are prolonged to the base of the nucellus n by means of the raphe r.
The hilum or base of the seed, and the chalaza or base of the nucellus are united by means of the raphe r.
The Insemineae include forms in which the nucellus is not developed, and therefore there can be no seed.
The point where the integuments are united to the base of the nucellus is called the chalaza (figs. 111, 112).
Plural nucelli (n-sěl'ī)
The megasporangium of a seed-bearing plant, located in the ovule. In angiosperms, it is the central portion of the ovule in which the embryo sac develops. In some cases of apomixis (production of seeds without fertilization), cells of the nucellus develop into an embryo.