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
(syn. Cryphaea lamyana (Mont.) Mull.Hal.). Locally distributed in W. and S. Europe, in S. Britain, France, Portugal, Spain, Switzerland and Italy; also N. Africa. In Britain known only in S. Wales, Devon and Cornwall.
Only on the banks of the River Tamar (SX37, SX38). It also occurs on the opposite bank in Devon.
Habitat & Ecology
Grows as an epiphyte on banks of the River Tamar in a zone above the normal water-level but subject to frequent or occasional submergence when the river-level is high. It prefers trunks and roots of Ash Fraxinus excelsior and Sycamore Acer pseudoplatanus , but small amounts occur on several other tree and shrub species. Capsules are frequent; abundant protonemal gemmae are produced in culture (Whitehouse, 1987).
Potentially susceptible to loss of habitat through clearance of riverside trees, floodprevention schemes or eutrophication. Extraction of water from higher reaches of the River Tamar could have an adverse effect if the flooding regime is altered.
Its sites on the banks of the River Tamar receive no special protection. Listed as Vulnerable on the UK Red-list (Church et al ., 2001), it receives special protection under Schedule 8 of the Wildlife and Countryside Act 1981 and is included in the UK BAP. Over the past decade Plantlife International has carried out numerous surveys of the species in Cornwall and Devon, and publicised the requirements for its conservation to landowners, Environment Agency and others. A detailed Species Dossier can be downloaded from the Plantlife International website.
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.