hear all about your experiment. there is a nursery fairly near where i live that sells mushrooms that someone in the area grows. i think they grow theirs in an old underground mine area. they are sort of secret about it. i am not sure of the variety they grow. big white ones that are kind of flat and of course the button mushrooms. they are tasty. good luck with your experiment.
that sounds fun. i'd never really thought about it until now, but with all the fungi that grow naturally around here we should have good conditions too. i'm tempted. will be interested to see how you go. 