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 devoniensis

Range & Status

A small (to 4cm) finely branched polysiphonous species that occurs very rarely on the

lower shore and in the shallow subtidal of sheltered coasts. Confined to south-western coasts.

A small (to 4cm) finely branched species growing on hard or friable bedrock, often through sand cover or where exposed to sand scour, from the lower intertidal to 4m depth of water. It is confined to south-western coasts and is known on moderately sheltered to extremely wave-exposed sites in Dorset, north and south Devon and north-eastern Cornwall.


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.