Myconids are a peaceful race of mushroom-folk who have sprouted cultures all over The Underdark.
About
"Myconids, for instance, have a nervous complex with no central point of control, much like worms" - Professor Ngise of The Bleak Academy
Despite having small colonies everywhere in the Underdark, there are several massive civilizations (called cultures) of Myconids located just east of the Osug Sea.