The larger of the two kinds of spores produced by some ferns.
〔植〕大孢子。比较MICROSPORE
Compare with microspore
Example sentencesExamples
Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
Microfossil assemblages from rare black and grey clays in this succession contain only a variety of seeds, Microcarpolithes hexagonalis and megaspores, and there are neither foraminifera nor other marine microfossils.
Meiosis results in the production of four megaspores, containing half the number of chromosomes of the sporophyte.
They have male spores called microspores and female spores called megaspores.
Their heterosporous life cycle (including both megaspores and microspores) is likely to be an adaptation to their aquatic habit.
Definition of megaspore in US English:
megaspore
nounˈmeɡəˌspôr
Botany
The larger of the two kinds of spores produced by some ferns.
〔植〕大孢子。比较MICROSPORE
Compare with microspore
Example sentencesExamples
Meiosis results in the production of four megaspores, containing half the number of chromosomes of the sporophyte.
Microfossil assemblages from rare black and grey clays in this succession contain only a variety of seeds, Microcarpolithes hexagonalis and megaspores, and there are neither foraminifera nor other marine microfossils.
Both of these genera are heterosporous, meaning that each species produces two distinctly different types of spores: microspores and megaspores.
Their heterosporous life cycle (including both megaspores and microspores) is likely to be an adaptation to their aquatic habit.
They have male spores called microspores and female spores called megaspores.