Colpomenia peregrina
Colpomenia peregrina, sometimes referred to by its vernacular names oyster thief and bladder weed, is a species of brown seaweed.
This species is native to the Eastern Pacific Ocean, but has been introduced to other areas. It was first noticed in... Wikipedia
Higher classification: Colpomenia
Scientific name: Colpomenia peregrina
Class: Phaeophyceae
Phylum: Gyrista
Family: Scytosiphonaceae
Order: Ectocarpales