Bryopsida

Bryopsida is a class of mosses commonly called true mosses. Its members are distinguished from other moss groups by characteristic sporophyte structures.

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Moss: A small, nonvascular land plant whose life cycle has a dominant gametophyte and a spore-producing sporophyte. Bryopsida is one of the major classes within this plant group.
Moss capsule: The spore-producing structure at the tip of a moss sporophyte. Bryopsida capsules often have specialized structures for controlled spore release.
Sphagnopsida: A class of mosses that includes peat mosses, with distinctive branch clusters and spore capsules. Peat mosses belong to a separate moss class rather than Bryopsida.
Sphagnum: A genus of mosses that forms peat and can retain large quantities of water. Its peat-forming role shows the ecological reach of mosses, though it lies outside Bryopsida.
Bryophyte: A nonvascular land plant group comprising mosses, liverworts, and hornworts. This broader grouping places Bryopsida among land plants that reproduce by spores.
Peristome: A ring of tooth-like structures around the opening of many moss capsules. Peristome teeth regulate spore release in many true mosses.
Andreaeopsida: A class of mosses commonly called granite mosses, with capsules that open by slits. Its capsule architecture differs from the characteristic structures of true mosses.
Peatland: A wetland ecosystem where waterlogged conditions allow partially decomposed plant material to accumulate as peat. Moss communities help build peatland habitats and influence their carbon storage.
Alternation of generations: A life cycle alternating between multicellular haploid and diploid stages. Bryopsida alternates a leafy gametophyte with a dependent diploid sporophyte.
Operculum: The lid that covers the mouth of a moss capsule before spore release. Its detachment exposes the capsule opening and often the peristome.