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nucellus
[ noo-sel-uhs, nyoo- ]
noun
- the central cellular mass of the body of the ovule, containing the embryo sac.
nucellus
/ ːˈɛə /
noun
- the central part of a plant ovule containing the embryo sac
nucellus
/ Դ̅̅-ĕ′ə /
, Plural nucelli Դ̅̅-ĕ′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.
Derived Forms
- Գˈ, adjective
Other yvlog Forms
- Գ·l adjective
yvlog History and Origins
yvlog History and Origins
Origin of nucellus1
Example Sentences
A papery remnant of nucellus lines the inner face of the woody shell, and, as in cycadean seeds, the apical portion is readily separated as a cap covering the summit of the endosperm.
The vessels of the cord are prolonged to the base of the nucellus n by means of the raphe r.
There are thus two integuments to the nucellus, an outer and an inner.
The nucellus is a cellular tissue enveloping one large cell, the embryo-sac or macrospore.
Each ovule is enclosed at the base by an envelope or collar homologous with the lamina of a leaf; the fleshy and hard coats of the nucellus constitute a single integument.
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