#biologyanimation A moss is a member of the plant phylum Bryophyta. These plants, along with the liverworts (Hepatophyta) and hornworts (Anthocerophyta), lack well-developed vascular systems. For their lack of a distinctive kind of conducting cell—the tracheid—they are called nontracheophytes.

The life cycle of a moss, like all plants, is characterized by an alternation of generations. A diploid generation, called the sporophyte, follows a haploid generation, called the gametophyte, which is in turn followed by the next sporophyte generation.

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