If there were seven human factions in SMAX, what would the remaining two be?

[Geo]

Hence why I think killing Planet's brain would need to be a bit more of an operation than that.  I mean, even detonating a lot of Planet Busters doesn't kill the Planet mind, it just irritates it.

Fungal roots go deep?

You have something there.
There's an alien interlude popup (discovery of the fungal towers by Progenitors) that discusses the matter. It describes tendrils with a reach of several hundred yards. No reason to think there aren't roots or even a core tuber deep in the ground which act as a nerve node as well.

[Buster's Uncle]

Oooh.  Mr. Potato Head!  You DO have something there.

Narrative possibilities in a root node brain, deep, deep in the Cave World among the Lost Tribe of Progenitor Progenitors.  A Tarzan on Alpha Centauri adventure.

[bvanevery]

Mr. Potato Head...

I love you
You know it's true
Mr. Potato Head, I love you

I don't think children should be allowed to sing to Planet.  Unless they're Gaian children.  Or they could be Cultist children, shortly before they're put to death.

"Planet needs new eyes, sweetie.  You want Planet to be able to see, don't you?"

[Geo]

Cultists and extremist Gaians: genetically altered to have a nerve acceptor into the brain compatible with planet mind.

[bvanevery]

Not to mention the unwholesome sex practices.