(in Orchidaceae) a viscid part of the rostellum, which is clearly defined and removed with the pollinia as a unit, and serves to attach the pollinia to an insect or other agent.
Copyright: Mike Bingham, Annette Willemen, Bart Wursten, Petra Ballings and Mark Hyde, 2011-17
Bingham, M.G., Willemen, A., Wursten, B.T., Ballings, P. and Hyde, M.A.
. Flora of Zambia: Glossary details: viscidium .
http://www.zambiaflora.com/speciesdata/glossary-display.php?glossary_id=832, retrieved 27 April 2017