(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: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave, 2002-17
Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M.
. Flora of Zimbabwe: Glossary details: viscidium .
http://www.zimbabweflora.co.zw/speciesdata/glossary-display.php?glossary_id=832, retrieved 29 April 2017