White leg things

[minkin]

So I bought some green mushrooms not so long ago and I have noticed these white leg kind of things coming from the rock they are on.

I'm unsure of what they are and are hoping someone can help me out.

I've attached several photos.

 

[Robert_ellis]

Are they kind if hard and calcerous? If so they are worms. Don't wooly about them.

 

[minkin]

I can't really tell but I don't like the look of them.

I did a fresh water dip before I added them and a small worm came off. Not the same as these though.

 

[herp_mommy]

Could possibly be brittle star legs. They stay in the rock