Aspect: | White or beige bush with numerous elongated branches. The ensemble can look very dense when polyps are extended as exemplified by the above picture. |
Population: | Common. |
Notable feature: | Owes its debatable designation to the fact that polyps retract absolutely flush with the surface of the branch, only leaving a light trace that gives the impression of a porous scar. |
Environment: | Tends to settle in open waters on a solid rock base. |
Behaviour: | - |