Dictyota dichotoma (Hudson) Lamouroux

Dictyota dichotoma

Description: Thallus flat with fairly regular dichotomous branches with parallel sides to 30 cms long, the tips usually bifid. Outer layer of small cells enclosing a single layer of large cells no more than one cell thick even near the base. Branches 3 to 12 mm wide, membranous without a mid-rib.

Habitat: Common, in places abundant. Littoral rock pools and sublittoral.

Distribution: Throughout the British Isles from the Shetlands to the Channel Islands, though less common on the eastern shores of England. Europe: Mediterranean, Azores, Portugal, Atlantic coasts of Spain and France, Baltic Sea and Norway. Atlantic coast of North America: Virginia. Further afield: Jamaica, Salvage Islands, Canary Islands, Mauritania to South Africa, Mauritius, Australia and Tasmania, Japan and Phillipine Islands.

Similar Species: Dictyota spiralis; Cutleria multifida.

Key Identification Features:

Distribution Map from BioMar data for Ireland - Google Earth map:  download this placemark (not got Google Earth installed?)

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

 Morton, O. & Picton, B.E. (2015). Dictyota dichotoma (Hudson) Lamouroux. [In] Encyclopedia of Marine Life of Britain and Ireland. Accessed on 2015-4-1

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