Unknown growth on live rock

[sheyandpete]

Hi everyone,
I seem to have a growth of, well i dont know how to describe this so i have added photos. If someone can please advise, this would be awesome. Thanks in advance

 

[reef lover]

Looks like a type of macro algae although idk the name or if its invasive or not.

 

[Jose Mayo]

In the format it resembles Acetabularia acetabulum ("sea umbrella"), but looking closely is distinguished, its stem seems thicker and does not have the radial design in its leaf ... perhaps another species of Acetabularia that I do not know.

Another possibility, if all the leaves sprout from the same stem, can be Caulerpa nummularia:

Best regards