Here's why:

* Bryophytes (like mosses, liverworts, and hornworts) have a life cycle dominated by the gametophyte generation, which is the haploid stage. The gametophyte produces gametes (sperm and egg) through mitosis.

* Sporophyte is the diploid stage in bryophytes. It arises from the fusion of a sperm and egg, and its primary function is to produce spores through meiosis.

* The sporophyte in bryophytes is typically small and dependent on the gametophyte for nutrition and support.

So, while the gametophyte is the dominant stage in bryophytes, it's the sporophyte that undergoes meiosis to produce the spores that will develop into new gametophytes.