The directions I mentioned are the side that gets warm sun the most. I might have stated that wrong in the above. So what I meant is for example as the sun travels through out the day this time of year, the side of the slope you want is the side that gets sun cast on it most. Now that holds true for the earlier mushrooms. Later on, when that side stop producing, the not so well sunny side will still warm up but not as fast. So, later mushrooms could be found there. I hope that makes sense.
Mark