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A single or double ring of setae (teeth) which fringes the mouth in many types of moss capsule; the peristome can be seen when the lid of a ripe capsule falls or is removed. The setae are hygroscopic (absorb moisture from the air). The fibres from which they are made are coiled helically; changes in humidity cause changes in the lengths of the fibres, twisting the capsule and producing jerky movements that aid in the dispersal of the spores.

Subjects: Plant Sciences and Forestry.

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