mushroom id help

[diver4life1992]

Can anyone please help me id this mushroom. I arrived as a hitchhiker on a leather coral that I purchased from Petco about a year ago. When I bought it it was only around 3/4" in diameter. Now it is almost 4" in diameter when fully expanded. When it is closed at night it seems to have several legs attaching it to the rock. If I sever one of the "legs" will it grow into another mushroom? Thanks for the help.

 

[Mike J.]

I believe it is a Ricordia.

 

[diver4life1992]

Thanks. That is what I was guessing. I just didn't think they get as big as this one.