Help ID'ing hitchhiker mushrooms....

[jetman220]

I got a plethora of these little fellas on a piece of live rock from a local store in Boulder.... They are a purplish hue with tinges of blue/green. One lone mushroom looks uniquely deferent in that its body is blueish in color with the absence of the bumps that the others have.

 

[blaxsun]

They look like rhodactis mushrooms.

 

[K1utch]

They do, and that's a pretty cool rock to pick up!