These were pretty neat, I hadn't seen other Lepiotas like these. They are mostly black or dark grey in the disk, but when young they have a lot of green in the disc also. One weird thing with these, when young, they will bruise bright yellow quickly. But this will also quickly fade to a dull light brown spot. Also I saw this on quite a few of them, if they are moist there will be golden droplets on them. I saw this on the cap and the stipe. I haven't seen these details in other references, but as a black centered Lepiota, I'll go with L. atrodisca for now.