Hitchhiker on the left

[SarahSmile]

Well hello there my friends. It's been exactly one million years since I've posted. ;)
I need help-
Got a hitchhiker on a Xenia rock. I need to know what is that thing on the left??

 

[Becky]

Welcome back @SarahSmile! Great to see you back on the forum :)

 

[Big K]

Is it stationary?

 

[SarahSmile]

Is it stationary?

Yes. It stays attached to the rock. Expands when the lights are on. Some kind of mushroom?