Pics of three mushrooms nearby each other and on the same heap of horse dung and wood chips. I believe that the dark strand on the upper stem in the first photo is part of the ring that is present on the stem of this species. I am assuming the ring is not visible on the other two due to the angle of the photos. I wanted to, and should have taken more photos/inspected these more closely, but alas there were many people around. I could feel their eyes on me and lost the courage to dig around in a pile of poo in public. @alan_rockefeller do you think this ID is correct? Thanks.