In Fungal Infection: Spore, a 'hivemind' is a collection of multiple infected individuals that become one form which bares a collective consciousness.
There are two types of hiveminds: crude hiveminds and organized hiveminds.
Known crude hiveminds:
Reconstructed Minds - an extremely basic and primitive hivemind, only being capable of notifying nearby infected of its presence and forcing them to give it biomass.
Brain Remnants - brain tissue harvested from Proto Hiveminds and The Matriarch, Brain Remnants on their own can only alert nearby biomass reserves from a larger hivemind if they feel threatened.
Challenge Watchers - the leftover consciousness of a larger hivemind that emerges from its biomass reserve deep underground. Challenge Watchers serve as a last ditch effort to eliminate the threat which destroyed the larger hivemind they originated from.
Calamity Limbs - generally, serve as simple vectors of infection. Though, some are capable of attacking nearby threats, however their capabilities are extremely limited.
Gastgebers - maldeveloped Scampers that are now controlled by the colonies of Mounds residing on their bodies, resulting in somewhat passive yet erratic behavior.
Bioblobs - rudimentary hiveminds created by Genesis Labs in numerous failed attempts to dispose of infected via acid, which only ended up grafting the individuals together into Bioblobs.
Known organized hiveminds:
Proto Hiveminds - results from a Reconstructed Mind after it has achieved enough biomass, these are extremely intelligent and influential hiveminds, serving as a major vector of infection. Proto Hiveminds are capable of mentally linking infected within a large radius of themselves. Furthermore, they create a massive root system beneath themselves, which is used for storing biomass and creating Organoids.
Hivetumors - form when a killed Proto Hivemind's Brain Remnants are able to form back together into a more conscious mind. Hivetumors are essentially weaker Proto Hiveminds that attempt to collect more biomass to evolve back into Proto Hiveminds.
The Matriarch - WIP.
Outpost Watchers - can only exist when in the presence of a larger hivemind. Outpost Watchers connect themselves to the biomass reserves of nearby larger hiveminds in order to further spread the reach of spread and Organoid defense.
Calamities - created by larger hiveminds via Wombs when they feel threatened. Calamities exist to kill and destroy, as well as acting as commanders to other infected on the battlefield.