This group's gametophyte starts as a branched filamentous structure called a protonema, and many types contain hydroid cells.

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Mosses are the only group among the options that have a gametophyte starting as a branched filamentous structure called a protonema, and they also contain hydroid cells. Liverworts and hornworts do not have hydroid cells in their gametophyte, while stoneworts and coleochaetophytes do not have a protonema stage.

This Group's Gametophyte Starts as a Branched Filamentous Structure Called