Tidepool Tim says, “These green algae remind me of felted wool - very thick and dense. It can be hard to find in our local bays every season. Once located it is very prevalent on hard surfaces forming a dense mat on the topside of rocks, boulders, & ledges. There is no evidence of predation on this weed but periwinkle snails and limpets are often found in mats of this algae or on the edges of growth areas.”