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
Mainly a N. European species, recorded from the Arctic southwards to France and Poland, with isolated localities in Italy, Hungary and perhaps Spain. In Britain, recently (post-1950) recorded only in Cornwall. There are older records from Wiltshire, Berkshire and Sussex.
Known at ca 18 sites, with a concentration of records in the Camborne-Redruth area of W. Cornwall but a scatter extending to the River Tamar.
Habitat & Ecology
The Cornish records are mainly from mine-spoil areas on substrata likely to have at least moderately high copper levels, but with one from slaty soil in a quarry. Elsewhere in Britain and S. Ireland it has been recorded from lowland Calluna heaths on damp clay soil or sand, especially where compacted by rabbits, from roadside banks and a railway bank. It is an autoicous species in which capsules are frequent, maturing in summer. Foliar gemmae are common.
Loss of sites from other parts of England has been attributed to destruction of lowland heath. A few Cornish sites have been lost, variously to scrub encroachment, illegal tipping of rubbish and ' tidying' of old mining ground.
Treated as Vulnerable in Red-list (Church et al ., 2001). Added to the UK BAP list in 2007. Cornish populations should be monitored; several are in SSSI.
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.