Pronunciation: (su-rē'dē-um), [key]
—pl. -di•aPronunciation: (-dē-u). [key] (in a lichen)
a group of algal cells surrounded by hyphal tissue, occurring on the surface of the thallus and functioning in vegetative reproduction. Also called brood bud, hologonidium.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.