definitely not Yuma. All rics have a fringe of tentacles and these have a flat outer edge I think the little "bumps" all over the disc r what's throwing you. Pics are very blurry still hard to pin down what it looks like. I am saying with 95% certainty that it is a discosoma and not a rhodactis, due to the pimple like pattern of protrusions along the surface. Rhodactis have a more even distribution of "tentacles" or patches of tentacles along it's surface. Either way they are pretty nice I'd say you got a deal on them.
Also, the easiest way to tell r. florida from r. yuma is theat yuma will have tentacles around the mouth stalk while florida will be smooth. Surest way to tell if ever in doubt. Mostly you can just look at them and know though they are kind of distinct after awhile.
Those are nice shrooms. Those are also some color morph of rhodactis sp. Not a discosoma sp. What u thought they were are called a ricordea (Florida) or a R. yuma because they are so closely related. Next time u want a yuma look for a distictive green rimmed mouth. Those are most likely yumas.. And IMO 50 bucks aint bad for 12 of em