Rare and scattered below normal tideline E. edge of N. basin strip, where this was taken. Common at low edge of rip-rap on S. shore and along edge of Schoolhouse Creek outlet channel with other seaweeds. This photo was taken at tide about -1.3. Not much below tide line -- usual scattered small clam shells, small mystery craters, barnacles and sparse sea lettuce on fragments of concrete, asphalt, or rock on mud flat.