Unlike their close relatives the Clubmosses, Spikemosses produce two kinds
of spore, which develop in fertile tips of stems and in the axils of leaves.
Both male and female spores can be found in the same "cone". The smaller
microspores grow into tiny gametophytes that produce male organs and the
larger megaspores develop into female gametophytes. Selaginella may
represent an intermediate step in the evolution of the early seed-bearing
plants which also have spores (pollen grains and ovules) that differ in size.
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