Tommann, unless you've been hunting mushrooms in the woods here for so long that you know exactly where your favorite rock, tree and bush are, you often won't know what you're picking.
Of course I'd be happy to fill up a bag full of Porcinis and Tea Tree mushrooms for dinner, but what I really want to do is grab a few of every variety I stumble upon to take home for spore printing and identification.
Colinflahive, do they have many other types of mushrooms? From what I've read and heard Matsutake patches are closely guarded for weeks by the more seasoned mushroom hunters. It seems a mushroom tourist would have more chance of finding Shangri-la than an unclaimed patch of Matsutakes.