Such a bizarre creature. I think I've seen a larger one once before, but it wasn't this pretty orange color.
Several stems on holdfast of Lessonia variegata.
Ascidiacea (commonly known as the ascidians or sea squirts) is a class in the Tunicata subphylum of sac-like marine invertebrate filter feeders. Ascidians are characterized by a tough outer "tunic" made of the polysaccharide tunicin, as compared to other tunicates which are less rigid.