Life of heterosporous pteritophyte requires water or air
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Spores that are wind-borne to shady, moist habitats germinate and yield multicellular, but microscopic, gametophytes, the sexual stage of thelife cycle. ... Although mostpteridophytes are homosporous (produce spores that are all the same size), a few groups are heterosporouswith large megaspores and small microspores.
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