Is Eywa a fungal organism?

[Tiberius]

Originally Posted by Human No More

Aihwa is right. Eywa works in the same way as the human brain, except neurons are replaced with trees and the synapses are the connections between them, plus overall there are more connections.

If you read the survival guide, it says that many plants on Pandora have an animal-like nervous system

No . Eywa does not work like the human brain, and there is nowhere in the film where anyone says this. Eywa displays abilities which appear supernatural, such as foreknowledge of the future (for example in the way she chose Jake). Although Eywa has a physical component, she also has a spiritual component. In an Interview James Cameron described Eywa as an "encompassing Spirit"