Peristome
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Peristome is an anatomical feature that surrounds an opening to an organ or structure. Some plants, fungi, and shelled gastropods have peristomes.
Peristome of Bryum capillare moss
Arthrodontous capsule of Dicranella varia moss
The earthstar Geastrum pectinatum showing a beaked peristome
The ventral surface of a shell of Cepaea nemoralis. The peristome is thickened and dark in an adult snail.
Polytrichaceae
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Polytrichaceae is a common family of mosses. Members of this family tend to be larger than other mosses, with the larger species occurring in particularly moist habitats. The leaves have specialized s
Atrichum undulatum