Mycologists: can you identify this mushroom?

Question

These are growing in my yard faster than anything I've ever seen. I used an online dichotomous key and determined they are Chlorophyllum molybdites, but I'm no expert, by any means. Here are 2 pics of the fungi in question:

http://s78.photobucket.com/albums/j83/reclusivesage/?action=view&current=Cmolybdites.jpg

http://s78.photobucket.com/albums/j83/reclusivesage/?action=view&current=Cmolybdites-cap.jpg

They've also formed a pretty cool fairy ring. check it out:

http://s78.photobucket.com/albums/j83/reclusivesage/?action=view&current=FairyRing01.jpg

Thanks for the help

Answer 1

I would have to agree with you that those appear to be Chlorophyllum molybdites.  Measurements and pictures of the gills would make identification easier though.

They are very poisonous, so do not eat them.