Hi ya, cath,
Alga singlar;
Algae plural
*If Ron were here, he'd be on you like a pile of ...algaes, hehe. (J/K, the man is a sweetheart.)
Your description seems to match that of a young
Valonia ventricosa bladder, so yeah, bubble algae. When they're small they can be easy to sever at the holdfast by 'dislodging'. Buoyancy varies, so they can float or sink.
Any chance you can post a pic?
Then we might know for sure if you should start tearing your hair out
horge
[This message has been edited by horge (edited 11-05-2000).]