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
Native: very rare, vulnerable and endemic. Found scattered around the coast from
Pembrokeshire to Dorset with one outlier in Ireland.
Known from 14 1km squares, with sites scattered along the north coast, and one near St. Mawes on the south coast.
Habitat & Ecology
On crumbling cliffs and sea-walls.
The colonies on man-made coastal structures (as at St. Mawes) are vulnerable to being destroyed by over-zealous maintenence, and where it grows naturally on edge of cliffs, cliff erosion may affect populations.
Some sites are on National Trust land.
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.