Producing two distinct types of spores: microspores that develop into male gametophytes and megaspores that develop into female gametophytes. This condition is found in all seed plants and some seedless plants.
From Greek 'heteros' meaning 'different' or 'other' and 'spora' meaning 'spore'. The term was established in botanical nomenclature to describe the evolutionary advancement of separate male and female spores, representing a key innovation in plant reproduction.
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