host-specific, absolutely true! as they set up 'mycorrhiza' - a symbiosis of mycelium with the root system of trees, and specific types of fungi prefer specific types of trees. Usually, fungi 'arrive' themselves - if the proper biotope has arisen in the place. Also they can disappear just as quickly if the sum of the conditions is erased. Hence the common misconception: "I have thrown away the remains of mushrooms at this spot many times - and all of a sudden they began to grow here." Yes, this may work, but only if suitable conditions for shrooms have been established. Otherwise, it doesnt work. (We talk here about shrooms that establish mycorrhiza). And the question "what conditions are suitable, specifically" is very complex.
These orange fungi appeared on a pine branch, under a spruce trees; I transplanted the same branch, exactly under spruce trees - so, will see. I am curious myself if it will work out or ... still, I dont hold my breath, heh. The chance of a positive dynamics is tiny 🐈 Thanks for dropping your comment, I am pleased. (A solid black line crossed my life again...)