Dryopteris affinis

Tracheophyta PteropsidaDryopteridaceaeDryopterisDryopteris affinis


A deciduous or evergreen fern found in deciduous woodland, along rides in coniferous plantations, in ditches, on shady banks and road verges, usually on acidic substrates. In more oceanic areas, it grows in the open on well-drained W.- or S.W.-facing hillsides, scree slopes and mountain ledges. It is also found on brickwork in urban areas. 0?705 m (Little Dun Fell, Westmorland).



World Distribution

European Temperate element.

© H. Higgins, IWNHAS

Broad Habitats

Light (Ellenberg): 5

Moisture (Ellenberg): 6

Reaction (Ellenberg): 5

Nitrogen (Ellenberg): 5


Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 14.3

Annual Precipitation (mm): 1160

Life form information

Height (cm): 80

Perennation - primary


Life Form - primary




Clonality - primary

Little or no vegetative spread

Distribution information

Count of 10km squares in Great Britain: 2272

Count of 10km squares in Ireland: 786

Count of 10km squares in the Channel Isles: 12

Atlas Change Index: 2.44

Weighted Changed Factor: 42

Weighted Change Factor Confidence (90%)


Distribution information

JNCC Designations


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.