Here's a breakdown:

* Dominant in what sense? "Dominant" can refer to:

* Size: The gametophyte stage is larger and more conspicuous in bryophytes (mosses, liverworts, hornworts) and some algae.

* Lifespan: The gametophyte stage in these groups also lives longer than the sporophyte stage.

* Independence: The gametophyte is independent and photosynthetic in bryophytes, while the sporophyte is dependent on it.

* In other plants, it's different: In vascular plants (ferns, gymnosperms, angiosperms), the sporophyte stage is dominant. The gametophyte stage is greatly reduced in size, often microscopic, and dependent on the sporophyte.

So, to summarize:

* Bryophytes and some algae: The gametophyte stage is dominant in size, lifespan, and independence.

* Vascular plants: The sporophyte stage is dominant in size, lifespan, and independence.

It's important to be specific about what you mean by "dominant" when discussing plant lifecycles.