peat moss, (genus Sphagnum), also called bog moss or sphagnum moss, genus of more than 300 species of moss (division Bryophyta). The taxonomy of Sphagnum species has been controversial, and various botanists accept quite different numbers of species. Peat mosses form dense clumps around ponds, in swamps and bogs, on moist acidic cliffs, and on lakeshores from tropical to subpolar regions. The pale green to deep red plants grow up to 30 cm (about 12 inches) tall. The veinless phyllids (leaflike structures) and stem cortex contain many interconnected enlarged dead cells, which have external openings through which water can enter. ...(100 of 331 words)

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