[marmot777]

For well a very well articulated argument for fungal intelligence, look up Paul Stamets, the mycologist on YouTube and elsewhere.

He's a serious scientist but he shows up in popular culture, too. For example, Lieutenant Commander Paul Stamets, a astromycologist serving on the USS Discover, was named after the real Paul Stamets.

[remexre]

There's a Hannibal character with the same surname too! https://hannibal.fandom.com/wiki/Eldon_Stammets

[pvarangot]

For a less articulated argument Terence McKenna also speculated that psilocybin is some kind of intelligent substance that came to earth via meteors and consciously played a role in humanity's self awareness.

https://en.wikipedia.org/wiki/Terence_McKenna#Psilocybin_pan...

[6510]

https://www.youtube.com/watch?v=ljy3TH1T0jk