bladderwrack seaweed or fucus vesiculosus

seaweed fucus vesiculosus bladderwrack black tang rockweed sea grapes bladder oak cut weed dyers red rock wrack alga castanha atlantic ocean iodine source treat goitre deficiency magoito beach portugal travel maritime sao joao das lampas lisbon sintra rich waters low tide healing properties mussel filled formations attached plants marine life closeup surface protist algae