A slender projection, like the beak of a bird (e.g. persistent style base on fruit); also rostellum;
In Compositae, the elongated apex of an achene, beneath the pappus, forming an often slender neck; also rostrum.
A terminal projection, for example, on a fruit, sometimes formed by a style that is persistent in fruit. Effectively the stalk between the achene and the pap pus hairs in the Daisy family.