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Bryophytes are plants that lack vascular tissue. Some bryophytes have tissues that transport water from root to tip, however these tissues are produce of non-lignin material and are therefore not considered truly vascular.
One of the defining characteristics of a bryophyte is that it does not produce external offspring. Bryophytes have no seeds and they do not flower. Instead, bryophytes reproduce by cloning their genetic structure via spores. Spores travel to new seeding grounds via wind or water. Bryophytes are not a division or class or plants. Rather, the word is a catch-all category describing certain mosses and flat land plants such as hornworts and liverworts.
The term bryophyta is used as a collective name to represent a group of plants that includes liverworts, hornworts and mosses growing predominantly in amphibious environment, these are able to live on land as well as in water. The group, therefore, goes well with the name of "amphibians of plant kingdom" owing to the amphibious habitat of plants.The plants show two morphologically distinct heteromorphic generations, i.e. gametophytic and sporophytic generations.
The gametophytes are well developed, green and autotrophic to which the sporophytes are not only attached but are also physically and physiologically dependent.
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