Gracilaria gracilis (Stackhouse) Steentoft, L Irvine & Farnham

Gracilaria gracilis

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: NBN map : National Biodiversity Network mapping facility, data for UK.

WoRMS: Species record : World Register of Marine Species.

iNaturalist: Species account : iNaturalist World Species Observations database

 Morton, O. & Picton, B.E. (2016). Gracilaria gracilis (Stackhouse) Steentoft, L Irvine & Farnham. [In] Encyclopedia of Marine Life of Britain and Ireland.
https://www.habitas.org.uk/marinelife/species.asp?item=ZM5480 Accessed on 2024-03-01

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