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.

Cruoria cruoriaeformis

Range & Status

A crustose alga found on shells and ma\'ebrl ( Phymatolithon calcareum ) fragments, in the subtidal to depths of about 5m. It has a western distribution and is relatively common in appropriate habitats. At the present time it is known from both the Falmouth and Helford estuaries in Cornwall, the Isles of Scilly, the Lleyn Peninsula, western and north-eastern Ireland and western Scotland. It is a Biodiversity Action Plan (BAP) Species.


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.