the rostellum of the stigma of violets, or of the operculum of many mosses
Source: wiktionary
Rostellum
Synonyms for "rostellum"
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1922, John Christopher Willis, "Orchidacea", entry in A Manual and Dictionary of the Flowering Plants and Ferns, page 471, The rostellum has an outer firm pouch, inside which is the viscid substance to which are firmly attached the caudicles of the pollinia. An insect entering the fl. probes the spur of the labellum and its back comes into contact with the rostellum and depresses the pouch, causing the viscid substance to adhere to the insect.
Source: wiktionary
In many orchids there is a discrete "viscidium," or sticky pad, formed by the rostellum.
Source: wiktionary
2005, Orchids of Manitoba: A Field Guide, Native Orchid Conservation Inc., page 20, The third stigma is sterile and has developed into the rostellum, a sticky structure that aids in pollination by attaching the pollen to insects.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.