noun. smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte.
Example sentences of the word microspore
Each scale holds a pollen sack, or microsporangium, and each pollen sack contains pollen grains, each called a microgametophyte, or microspore.
2. Noun, singular or mass
In the diploid stage, cells have two sets of chromosomes, The male diploid gametophyte in the gymnosperm reproductive cycle is a pollen grain with two sets of chromosomes called a microspore.
3. Preposition or subordinating conjunction
The pollen sacs contain microspore mother cells, or MMCs.