Broyophytes use spores rather than seeds to reproduce, and they do not have a vascular system. There are more than 25,000 species of bryophytes in the world, so beyond these basics, there is not one universal structure for these plants.
Since bryophytes do not have a vascular system, they are cannot pull water and nutrients a great distance from the ground. Many species have adapted by growing in mats that are low to the ground, and some can even survive in dry areas and grow quite tall. The liverworts, hornworts and mosses are the three classes within the bryophyte species. Unlike flowering plants that spend most of their time in the sporophyte phase, bryophytes alternate between the gametophyte and sporophyte phases.