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A spore which is produced by heterogamous fertilization and from which the sporophytic generation develops.



the resting zygote in lower plants that have an oogonium. The oospore has a considerable reserve of nutritive matter, which is used during sprouting, and a thick, multilayer wall, which provides protection from such unfavorable conditions as drought or cold. When the oospore sprouts, its nucleus divides with reduction.

References in periodicals archive ?
Celakovsky (1874) had recognized three generations in the life cycle of Coleochaete: zoospore-producing thalli (A); gamete-producing thalli (B); and the multicellular body produced from the fertilized oospore (C).
At the same time Cristatella mucedo statoblasts appear in the sediment record and the abundance of Characeae oospores rises considerably.