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.

Cephaloziella calyculata - Entire Threadwort

Range & Status

Mainly a Mediterranean species in Europe, extending eastwards to the former Yugoslavia and northwards along Atlantic coasts to S. Wales; also Tunisia and Macaronesia. Most British localities are in Cornwall, with one each in S. Glamorgan and N. Somerset.

Regional Distribution

Recent records are from 12 sites, mainly in W. Cornwall but with one population in E.

Cornwall (Crow' s Nest).

Habitat & Ecology

Often occurs in small quantity, growing amongst thin grassland on heathy cliff slopes, on spoil from disused copper mines, the wall of a ruined building and the bank of a creek. It is an autoicous species in which perianths are frequently produced but sporophytes are rare. Foliar gemmae are occasional or common.


No detailed information. Some populations are potentially at risk from landscaping and other ' tidying' operations that are now prevalent on old mining ground in W. Cornwall.


At least two populations are in SSSI. Treated as Vulnerable in Red-list (Church et al ., 2001). The species was added to the UK BAP list in 2007.


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.