Acadia National Park Ascophyllum Ascophyllum nodosum Bar Harbor Beachcombing Fucus Knotted Wrack Maine Mount Desert Island New England Northern Rock Barnacle Other Places Rockweed Sea Semibalanus balanoides alga barnacles close up close-up closeup coast coastal cold detail flake flakes frozen hanging down ice low tide macro marine algae marine biology ocean seashore seaweed snow snowflake snowflakes snowing specimen winter