oosphere

A nonmotile female gamete formed in the oogonium of an alga, fungus, oomycete, or bryophyte.

In cryptogams, the naked nucleated spherical or ovoid mass of protoplasm in the center of the oögonium, which after fertilization develops the oöspore.

An unfertilized, rounded mass of protoplasm, produced in an oögonium.

An analogous mass of protoplasm in the ovule of a flowering plant; an embryonic vesicle.

A large nonmotile egg cell formed in an oogonium and ready for fertilization

a gamete; used especially of lower plants