Fungi usually have such a short live span and are so unpredictable on when or where they will return, I'm not sure a Forum dedicated to them would get a lot of traffic. I think, due to their function, they would be an appropriate topic in the All Things Gardening or Farming forums. Any place where discussions on things like mulch, Hugelfultur beds, lasagna beds, encouraging earthworms - all that sort of thing - is where fungi play a major role in conditioning the organic material into a useful and usable plant growing medium. I'd be really surprised if the Hugelfultur method would work at all without the fungi aiding in breaking down the woody material. They have a symbiotic relationship to plants that is undeniable.