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.
Physcomitrium
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Physcomitrium is a genus of mosses, commonly called urn moss after its urn-like calyptra, that includes about 80 species and has a cosmopolitan distribution. The scientific name comes from the Ancient
