Ricordea vs Mushroom?

Could someone explain what makes a mushroom a ricordea? Differences between a regular mushroom and a ricordea.

The reason I am asking, I bought a rock with a bunch of hairy mushrooms on it. The kid working there was like yeah it's got 2 kinds of mushrooms. The second kind look very much like the ricordea they were selling for $35 each.

 

can you post a pic or two??

 

at $35 each they are likely ricordia or yuma.they have bubbles all over.i think yuma are the ones that have bubbles on the mouths and ricordia have smooth mouths,hope thats not backwards.hairy mushrooms look just like they sound.

 

Corallimorpharians (Mushroom Corals) - Aquarium Coral Profiles
If they are hairy, they are Rhodactis corallimorphs(mushrooms)!
Check this site out for some help and pictures!

 

Here's a picture. I think one is a frilly mushroom and the other is a hairy mushroom. Thoughts?