|RHODOPHYTA : GRACILARIALES : Gracilariaceae||RED ALGAE|
Description: Thallus terete, rising from a small discoid holdfast terete to 60 cms long. Unbranched or variably branched, irregular. Cystocarps large, to 1 mm in diameter, produding as nodules.
Habitat: Common. Epilithic in the lower littoral and sublittoral to 15 m.
Distribution: Widely distributed around the British Isles from the Shetlands to the Channel Islands. Europe: Mediterranean, Portugal, Atlantic coast of Spain, Netherlands, Helgoland, Baltic Sea and Norway. Atlantic coasts of America: from Canada to Brazil. Further afield: Bermuda, Canary Islands, Namibia, South Africa, India and in the Pacific Ocean from British Columbia to Baja California, Philippines and Fiji.
Similar Species: Cystoclonium purpureum can be distinguished by its branched holdfast and by the small cells in the centre of the thallus. Rhodomela confervoides shows a large cell in the centre surrounded by about 5 larger cells and others decreasing in size outwards.
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). Gracilaria gracilis (Stackhouse) Steentoft, L Irvine & Farnham. [In] Encyclopedia of Marine Life of Britain and Ireland. |
http://www.habitas.org.uk/marinelife/species.asp?item=ZM5480 Accessed on 2015-7-30
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