A spore occurring in groups of four, in particular (in a red alga) each of four spores produced together, two of which produce male plants and two female.
- The haploid tetraspore is released from this filament and is carried by water currents and tides to new locations.
- The tetraspores and the gametophytes are the only haploid stages in the coralline algae.
- The haploid tetraspores erminate and give rise to haploid gametophytic plants.
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