Algae ID Help: White stalk with a green tip/frawn

[Tristan]

So this thing showed up on a snail that I got. It initially didn’t have that round green disk at the top, it was more white and filamentous. Is it even a type of algae?

 

[Dan_P]

So this thing showed up on a snail that I got. It initially didn’t have that round green disk at the top, it was more white and filamentous. Is it even a type of algae?

Possibly a Caulerpa species

 

[ISpeakForTheSeas]

So this thing showed up on a snail that I got. It initially didn’t have that round green disk at the top, it was more white and filamentous. Is it even a type of algae?

Acetabularia - Mermaid's Wine Glass.

 

[Tristan]

Acetabularia - Mermaid's Wine Glass.

Thank you!