What is the function of the peristome?

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What is the function of peristome teeth?

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Peristome is present inside the capsule of the moss sporophyte. When the sporophytes mature the calyptra and the operculum also falls off exposing the peristome teeth. They are tiny tooth like structures found at the mouth of the capsule. It can be seen as one or two rows and this remain closed during the wet season and they get exposed during the dry season.

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