- bladderwrack, Ascophyllum nodosum - similar to and found with black rockweed
--1 is a kind of rockweed
- bladderwrack, black rockweed, bladder fucus, tang, Fucus vesiculosus - common black rockweed used in preparing kelp and as manure
--2 is a kind of rockweed
--2 is a member of genus Fucus