<P> Types of seedless vascular plants: </P> <Ul> <Li> Ferns </Li> <Li> Spikemosses </Li> <Li> Quillworts </Li> </Ul> <P> In seed plants the microspores develop into pollen grains each containing a reduced, multicellular male gametophyte . The megaspores, in turn, develop into reduced female gametophytes that produce egg cells that, once fertilized, develop into seeds . Pollen cones or microstrobili usually develop toward the tips of the lower branches in clusters up to 50 or more . The microsporangia of gymnosperms develop in pairs toward the bases of the scales, which are therefore called microsporophylls . Each of the microsporocytes in the microsporangia undergoes meiosis, producing four haploid microspores . These develop into pollen grains, each consisting of four cells and a pair of external air sacs . The air sacs give the pollen grains added buoyancy that helps with wind dispersal . </P> <P> Types of Gymnosperms: </P>

Where are the microspores and megaspores formed in gymnosperms
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