1 The gelatinous, outer surface layer of a prokaryotic cell (also known as the sheath in cyanobacteria), which is composed primarily of polysaccharides. In pathogenic bacteria, and possibly in others, it appears to serve a protective function against the defensive mechanism of the host, since such bacteria become non-infective in its absence.
2 The spore-bearing structure of a moss or liverwort.
3 A dry fruit, normally dehiscent.
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