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.

Byssoloma subdiscordans - a lichen

Range & Status

A very rare pantropical lichen known from very few sites in Britain. This shade-tolerant

species has its headquarters on the heathland of the Lizard Peninsula. More recently

Giavarini (Giavarini, 2002) has recorded it on Ling Calluna vulgaris stems in at least six metalliferous mining sites away from the Lizard Peninsula . It has also been found on Common Gorse Ulex europaeus . On the Lizard and the various metalliferous sites this species is prone to periodic heathland fires and on the metalliferous sites landscaping activities may also be problematical. Elsewhere known from west and central Ireland.


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.