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any bryophyte of the phylum Bryophyta , typically growing in dense mats on trees, rocks, moist ground, etc See also peat moss

a clump or growth of any of these plants

any of various similar but unrelated plants, such as club moss, Spanish moss, Ceylon moss, rose moss, and reindeer moss

a peat bog or marsh

Any of various green, usually small nonvascular plants of the division Bryophyta. Mosses, unlike liverworts, have some tissues specialized for conducting water and nutrients. As in the other bryophytes, the diploid sporophyte grows on the haploid gametophyte generation, which supplies it with nutrients. Mosses often live in moist, shady areas and grow in clusters or mats. Sphagnum mosses play a crucial role in the ecology of peat bogs.

See more at bryophyte

Any of a number of plants that look like mosses but are not related to them. For instance, reindeer moss is a lichen, Irish moss is an alga, and Spanish moss is a bromeliad, a flowering plant.