A perennial, evergreen fern which grows in a range of rocky habitats, including cliffs, rock faces, screes, mine waste and, perhaps now most commonly, on walls. 0-870 m (Macgillycuddy`s Reeks, S. Kerry).
There is evidence for some decline in East Anglia since 1950. This is a polyploid complex within which three ecologically and morphologically fairly distinct taxa have been recognised within the British Isles, all of which are mapped here separately. However, this taxonomic treatment over-simplifies a far more complex pattern of reticulate evolution.
Circumpolar Southern-temperate element, with a disjunct distribution.
PLANTATT - Attributes of British and Irish plants. (.zip 1455KB) This dataset was compiled and published in 2004, and last updated in November 2008. Download includes an Excel spreadsheet of the attributes, and a PDF explaining the background and nomenclature. Note that the PDF version is the booklet as published, whereas the Excel spreadsheet incorporates subsequent corrections. A hardcopy can be purchased from the Centre for Ecology and Hydrology.
Atlas text references
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1972)
1978. Ferns and their allies. The Island of Mull: a survey of its flora and environment. :12.1-12.7.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1997. The ferns of Britain and Ireland, edn 2.