peristome

peristomi, suuvarus

suunympärysjaoke puhekieltä One or two rings of tooth-like appendages surrounding the opening of the capsule of many mosses.
1911, s:1911 Encyclopædia Britannica/Bryophyta|Bryophyta, article in w:Encyclopædia Britannica Eleventh Edition|Encyclopædia Britannica Eleventh Edition,

Its removal does not, however, leave the mouth of the capsule wide open, for around the margin are two circles of pointed teeth forming the peristome.

We can distinguish therefore in the body of a polyp the column, circular or oval in section, forming the trunk, resting on a base or foot and surmounted by the crown of tentacles, which enclose an area termed the peristome, in the centre of which again is the mouth. (..) The mouth may be level with the surface of the peristome, or may be projecting and trumpet-shaped.