You are making a matsutake

The elusive pine mushroom can only be found for a few days out of an average year and I have seen them reach prices as high as one hundred dollars a pound for number ones, (closed veil and no defects), during years when they are harder to find.
I have been told, and can't find any evidence to refute, that many have tried but pine mushrooms can not be farmed.
Being the curious little fellow that I am I wondered why, and think I may have figured it out. During the years I still went picking I noticed that if you found a patch you could find another if you kept to the same elevation. I think that this is not because of light levels, precipitation, proximity of plants they like, (they are called pine mushrooms for a reason), or even the absence of harmful insects although I am sure all of these things factor in. No, I think that the reason no one has successfully farmed them is that they will only grow at certain air pressures.

So the idea is to set up a small weather station at a location where there is an existing patch and for an entire year keep daily notes on climate and light conditions but more importantly, barometric pressure changes.
At the end of the growing season collect your patch intact, transport it to your climate controlled indoor grow room, spread the spores and try to mimic the exact conditions from the course of the last year.

If successful keep secret and try not to flood the market too badly.