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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.

Acaulon mediterraneum

Range & Status

(syn. A. muticum var. mediterraneum (Limpr.) Sergio). Differs from the commoner A. muticum (Hedw.) Mull.Hal. only in microscopic characters of the spores and overlooked in Britain until recently (Holyoak, 2003a). British records are mainly from Cornwall, with single specimens also from S. Devon and S. Somerset. Elsewhere it occurs mainly in Mediterranean countries, northwards to France and S. Sweden, but also in S. Australia.

Regional Distribution

Seven records are mainly from coastal areas, although it is known by old specimens from Bodmin.

Habitat & Ecology

Grows on open or lightly shaded patches of soil, exposed e.g. above sea-cliffs or on cattletrodden track edges. The small plants are short lived winter ephemerals, with capsules maturing from October to January.


Potentially at risk from the reduction of open habitat around the coasts now that cliff-top grazing has largely ceased and coastal scrub cover is increasing. Excessive trampling along the coastal path may also reduce its potential habitats.


Several records are in SSSI or other protected coastline.

Click here to see Dr. David Holyoak's Bryophyte Flora for this species


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.