The pseudotentacles (bumps) spread up the elevated mouth of Ricordea yuma. The pseudotentacles of Ricordea florida stop at the mouth, giving it a smooth appearance. There are also some differences with pseudotentacle size/shape/distribution and the edge of the oral disc. But, I think the easiest way to distinguish between them is the mouth, yuma = bumpy, florida = smooth.
Try searching through some pictures on RC or Google Images. You will pick it up pretty quickly :thumbsup: