Lichen

Lichens are spiky, mushroom-like plants that have a hard, membrane skin that supports the weight of the plant, allowing mucous fluids to flow freely inside the plant. 
They vary in size, but can be shown to be quite tall, even taller than a Na'vi. At night, the caps become vibrantly bioluminescent on contact.
==Trivia==
* Although their design appears in the first film, the anemonid in The World of Avatar: A Visual Exploration and Pandora Survival Guide share the same appearance, suggesting that lichens have been retconned to become anemonids.
==Source==
*James Cameron's Avatar: The Game - Ingame Pandorapedia
de:Flechte
pl:Liszaj
ru:Лишайник
Category:Flora
Category:Avatar: The Game