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.

Pterosiphonia ardreana

Range & Status

Epilithic on sandy bedrock and boulders amongst Rhodochorton floridulum in lower shore pools and on sand scoured vertical and horizontal bedrock from about 1m above Extreme Low Water to about 20m depth. Also found on crustose coralline algae and amongst Alaria esculenta plants on extremely wave-exposed sites. A rare, southern species know from relatively few sites, including north Cornwall, Pembrokeshire and the west coast of Ireland.


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.