1. microspore

noun. smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte.

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Example sentences of the word microspore

1. Adverb
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.