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Bryophytes are essentially nonvascular plants, meaning they do not have xylem or phloem. The habitations of bryophytes are widely varied and include bare rocks in the scorching sun to frozen alpine slopes. Bryophytes include mosses, liverworts and hornworts. These groups of plants require external water, usually in the form of dew or rain. Some bryophytes grow exclusively in dark, damp environments in order to provide moisture. Water is essential for bryophyte reproductive activities. Most mosses have water-conducting cells called hydroids in the centers of their stems, and some even have food conducting cells called leptoids. These cells are not nearly as efficient as xylem and phloem and generally, bryophytes are not very tall plants. The lack of vascular tissue leaves the plant body very soft and pliable. Bryophytes are good nest-making material for birds.
The alternation of generations in bryophytes is quite obvious as the gametophyte generation is the ‘leafy’ plant that is generally visible. The sporophyte generation that produces spores is located at the tips of the ‘leafy’ gametophyte generation. The sporophyte generally looks like a slender stalk with a cap on top. While the lifecycles of all bryophytes are similar and even their chromosome number and habituation have similarities; they care divided into three distinct divisions based on the few differences in structure and reproduction.
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