Green Spored Parasol

Anytime man. :)

That's what it looks like to me also Lars, and there are hardly any mushrooms (that I know of) that grow in that environment with a white cap and brown warts clustered in the centre.

I think Ivan is right - on the second pic you can see a slight tone of greenish gills

Looks to be an almost-mature Green-Spored Parasol, chlorophyllum molybdites. Those brown warts, that persistent ring, the flat umbrella-like shape of the cap, and the brown stem that this is found with all appear to match this suggestion, but I could always be wrong. What would make this almost certain is if you saw any faint or strong hints of green in the gills, as a camera might sometimes not be able to show this in a picture, especially if you were already struggling with the humidity. Compare with these two small ones, however; http://www.projectnoah.org/spottings/7396498 And here's more mature specimens from Mushroom Expert: http://www.mushroomexpert.com/chlorophyllum_molybdites.html Love the shots you took by the way, they do justice to a simple yet majestic kind of lawn mushroom. :)