oosphere

[oh-uh-sfeer]

noun

Biology.

1. an unfertilized egg within an oogonium.

oosphere

/ ˈəʊəˌsfɪə /

noun

1. a large female gamete produced in the oogonia of algae and fungi

oosphere

1. A large nonmotile female gamete formed in an oogonium, such as the eggs formed in the oogonium of an oomycete.

Word History and Origins

Origin of oosphere¹

First recorded in 1870–75; oo- + -sphere

Example Sentences

In Cystopus Bliti the oosphere contains numerous nuclei, and all the male nuclei from the antheridium pass into it, the male and female nuclei then fusing in pairs.

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Guided by the synergidae one male-cell passes into the oosphere with which it fuses, the two nuclei uniting, while the other fuses with the definitive nucleus, or, as it is also called, the endosperm nucleus.

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The subsequent behavior of the pollen cell, its division and its fertilization of the germinal vesicle or oosphere, leave no doubt as to its analogy with the microspore of vascular cryptogams.

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We thus have a process of “multiple fertilization”; the oosphere really represents a large number of undifferentiated gametes and has been termed a coenogamete.

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After impregnation the fertilized oosphere immediately surrounds itself with a cell-wall and becomes the oospore which by a process of growth forms the embryo of the new plant.

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