Halidrys siliquosa (Linnaeus) Lyngbye

Halidrys siliquosa

Description: Thallus to 2 m long, compressed tough and leatherly, attached by strong holdfast. Branches distichous and regularly alternate. Air bladders, up to 5 cms long, are oblong and stalked towards the ends of the branches. The air bladders are divided by cross walls visible when sectioned longitudinally.

Habitat: Common. Low littoral rock pools and upper sub-littoral.

Distribution: Widespread around the British Isles. Europe: Portugal, Atlantic coasts of Spain and France, Netherlands, Baltic Sea, Norway and the Faroes.

Key Identification Features:

Distribution Map from NBN: Grid map (fast) : Interactive map (slower, requires login to view records) : National Biodiversity Network mapping facility, data for UK.

 Morton, O. & Picton, B.E. (2015). Halidrys siliquosa (Linnaeus) Lyngbye. [In] Encyclopedia of Marine Life of Britain and Ireland. Accessed on 2015-11-25

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