A rhizomatous perennial fern of very sheltered, often deeply shaded, humid habitats; these include acidic rock faces, humic banks and tree trunks, particularly in deep stream valleys, and crevices on upland boulder scree. 0-760 m (Galtee Mountains, Co. Tipperary).
The distribution of H. tunbrigense is largely stable, although until recently many small populations have been overlooked. However, 20% of sites in S.E. England have been lost since 1950, largely through woodland loss and shading by Rhododendron ponticum.
Oceanic Temperate element; also one site in N. America.
Count of 10km squares in Great Britain: 197
Count of 10km squares in Ireland: 112
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -0.54
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.
1995. Tunbridge Filmy-fern, Hymenophyllum tunbrigense (Hymenophyllaceae: Pteridophyta), in South-East England in 1994/1995. Fern Gazette. 15:51-63.
1972. Biological Flora of the British Isles. No. 126. Hymenophyllum tunbrigense (L.) Sm. (pp. 245-258), Hymenophyllum wilsonii Hooker (258-268). Journal of Ecology. 60:245-268.