From the tips of the gametophore stems or branches develop the sex organs of the mosses.
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A single mat of protonemata may develop several gametophore shoots, resulting in a clump of moss.
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When a moss first grows from the spore, it grows as a protonema which develops into a leafy gametophore.
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It is a specialized, extended muscular hydrostat used to store spermatophores, the male gametophore.
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The adult gametophyte of mosses is called the gametophore as it carries the gamete-producing sex organs.
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More examples
A modified branch bearing gametangia as in the thalloid liverworts
The word gametophore, also known as gametangiophore, is composed of gametangium and "phore" (Greek u03A6u03BFu03C1u03AC, "to be carried"). In moss and fern (Archegoniata) the gametophore is the bearer of the sex organs (gametangia), the female archegonia and the male antheridia. If both the archegonia and antheridia are arranged at the same plant, they are called monoecious...
The mature gamete-producing structure of a gametophyte body of a moss.
The shoot of a bryophyte. The gametophyte of one individual organism is made up of many gametophores.