I believe this is a Clitocybe gigantea (Giant Clitocybe).  It was growing under a tree in a small bit of grass behind the motion capture studio at Electronic Arts Canada. Hi John.....Yes, I do believe your specimen is likely Clitocybe gigantea, though in your posted pic I cannot tell for sure if the gills are decurrent or what the scale of size is (good to include a common coin in the captures for this purpose and an inverted cap/stem as well.) I just ran into a fair-sized group of this species myself yesterday at about 9700 Ft. elev. in Eaglesnest Wilderness in Summit County, Colorado, USA. In spite of recent rather dry conditions, this cluster was found at the edge of a fallen log, on the margin of a stand of Douglas fir adjacent to a grassy open meadow, consistent with reported habitat. I will be conducting microspical examination on my specimen soon and report back to you on the results when they become available. Mail be back with any comments you might have anent this or any other matters mycological. Apparently this dialogue box will not accept a JPG photo attachment of my own sample, but if you get back to me via my personal EM, I can forward an image to you if you should like. Best of luck to you, Jeff Jeff Friday, September 5th, 2008 at 12:26:45