Shroom compatibility?

[FishNutty]

I've got two different types of shrooms(plain, smooth purple and what I *think* is a rhodactis), and I'd like to put them both on the same rock. It's a smaller rock, and they would probably wind up touching. Would they be okay, or is one going to kill the other?
Here's a picture of the shroom I'm not totally sure of the ID on-

 

[Das awesome]

I have a rock that has 4 different types including ricordeas and rhodactis and nothing has happened yet. That's where they all just kinda met up as they kept reproducing and they've been together about 4 months. I have a feeling the ricordeas will start stinging the others, but since that's not one of the shrooms you have, you should be fine.