Cornish Biodiversity Network  -  Supporting Wildlife Recording

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Cornish Red Data (2009)

The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.

Polysiphonia foetidissima

Range & Status

A large (to 10cm) species, very finely polysiphonous and very rare. The original collection was made by Cocks, in about 1855, from the west side of Plymouth Sound. Habitat details are sketchy but Cocks' specimens were found at sites with little wave-exposure and fairly strong tidal currents. Recent searches to re-find this species at the original sites were unsuccessful. There are only two known 20th century records elsewhere, in Pembrokeshire and on the west coast of Ireland. It is also known from Normandy, southwest France, Portugal and the Mediterranean.


I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.

The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.

Cornish Biodiversity Network. 2017.