RHODOPHYTA : Ceramiales : RhodomelaceaeRED ALGAE

Polysiphonia foetidissima Cocks ex Bornet


Description: Thallus erect to 11 cms long with terete axes and many fine polysiphonous branches. Pericentral cells 7 - 8 and ecorticate.

Habitat: Very rare. No details available.

Distribution: in the British Isles: only three records, one 19th century from Cornwall and two 20th century records one from from south Walesthe other from Co. Galway. Europe: Mediterranean, Portugal and France. Further afield: Bermuda.

Distribution Map from NBN: Polysiphonia foetidissima at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Polysiphonia foetidissima at iNaturalist World Species Observations database.

WoRMS: Polysiphonia foetidissima at World Register of Marine Species.

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 Morton, O., Keatley, L., Morrow, C.C. & Picton, B.E. (2026). Polysiphonia foetidissima. Cocks ex Bornet. [In] Encyclopedia of Marine Life of Britain and Ireland.
https://habitas.org/mbdp/species.php?item=ZM11100. Accessed on 2026-11-01