Fucus is a genus of brown algae whose members inhabit rocky coastlines throughout much of the world. Perhaps the most well-known type is Bladder Wrack (F. vesiculosus), a species whose branching, flattened fronds have obvious midribs and, often, but not always, feature distinctive paired air bladders (pictured below). All Fucus species are edible and are rich sources of iodine. In his book Seaweeds: Edible, available, & sustainable (2013, p. 85), Ole Mouritsen describes the fresh young growth of Bladder Wrack as "extremely tasty." (For more edibility info, see Green Deane's Bladderwrack profile.) Bladder Wrack commonly shares rocks with Knotted Wrack in the mid-to-upper intertidal zones.