Etymology
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microspore (n.)

a smaller-than-usual spore in a plant, or a type of fungus with small spores, 1856, from micro- + spore. Related: Microsporous; microsporidian.

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Definitions of microspore

microspore (n.)
smaller of the two types of spore produced in heterosporous plants; develops in the pollen sac into a male gametophyte;
From wordnet.princeton.edu