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.

Hymenophyllum wilsonii - Wilson's Filmy-fern

Range & Status

Native. An oceanic Boreo-temperate fern; confined to the hyperoceanic zone of Western Europe and Macaronesia. Found in western Britain and Ireland.

Regional Distribution

Only found on Bodmin Moor and West Penwith granite moorland areas.

Habitat & Ecology

Found amongst granite boulders, on clitter slopes and in granite tor crevices. It needs high humidity all year round.


No present ones known.


Some of the sites are owned by the National Trust and/or SSSI.

Click here to see Aphotoflora images by David Fenwick


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.

Cornish Biodiversity Network. 2017.