Green mushroom id

[PPChalk]

Hello, I've got some mushrooms that have popped up on some 15+ year old live rock that I've never seen before, any insight would be appreciated.

 

[MoshJosh]

Don't think those are mushrooms. Hard to see in the picture, but looks like there are a number of individual polyps coming out of the coral (a few are circled here:

Looks more like a scroll coral or tubinarea to me:

Any way to get closer or more zoomed in picture?

 

[liddojunior]

That’s a cabbage leather coral.

I have little bits of it on my rock that grew out of nothing and turned to mini cabbage leather colonies. It removed a cabbage leather from my rock to move it to a new tank. And didn’t realize the smallest tiniest bits of tissue floated and attached to the rock randomly to grow

 

[MoshJosh]

That’s a cabbage leather coral.

Seems obvious now that you say it haha! Maybe cause my cabbage is a different color I didn’t even think that! Anyway I agree likely a cabbage coral