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.
Range & Status
Common where it occurs in south-west England and south Wales but virtually absent from the rest of Britain. Possibly expanding its range nationally, and may be an old introduction to England (Sutton & Harding, 1989 cited in Hopkin, 1991).
First recorded in Cornwall in the Mawgan area (SW72), where it was collected by R.S.
Bagnall on the 14th May 1943 (Harding, 1977). The specimen which supports the first Cornish record is from a tube labelled A. vulgare (sic) in the W.E. Collinge collection and should be viewed with some degree of uncertainty. Not recorded again in Cornwall until 1989, and from then at five sites, Morwenstow, Danescombe (near Calstock), Polruan, Readymoney and Lower Predannack Cliff.
Habitat & Ecology
This species can be found at sea cliffs and a variety of ruderal habitats including gardens and in or around buildings.
Sites on both the north and south coast of Cornwall are within Special Areas of Conservation and Sites of Special Scientific Interest.
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.