What Are These Cool Looking Mushrooms?

[ZUnit]

Found these today walking home. They were near a creek and a road in Western, PA growing out of the ground. Looks kinda like a volva at the base or thickness. They haven't opened up yet I don't think so no gill color unfortunately. Maybe I will go back over tomorrow and take more pictures and get a spore print. 

Perhaps Macrolepiota procera or the parasol mushroom?

Actually now I am thinking False Parasol or Chlorophyllum molybdites.

[bobby b]

Chlorophyllum

[Dave W]

I agree, likely a species of Chlorophyllum.