peristome
The fringe surrounding the mouth of the capsule upon removing the lid.
GardenWeb Glossary of Botanical Terms
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peristome -- A set of cells or cell parts which surround the opening of a moss sporangium. In many mosses, they are sensitive to humidity, and will alter their shape to aid in spore dispersal.
 See also: Genera, Epiphyte, Capsule, Plant
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