Dryopteris dilatata

Tracheophyta PteropsidaDryopteridaceaeDryopterisDryopteris dilatata


This deciduous fern grows on moderately to very acidic, well- to poorly-drained substrates. Habitats include deciduous and coniferous woodland, hedgerows, ditches, open moorland, rocky slopes, boulder scree and rock fissures. It can also be epiphytic in damp climates. 0-1050 m (N. of Loch Rannoch, Mid Perth), and reportedly to 1125 m in Scotland.



World Distribution

European Temperate element.

© P. Shannon

Broad Habitats

Light (Ellenberg): 5

Moisture (Ellenberg): 6

Reaction (Ellenberg): 4

Nitrogen (Ellenberg): 5

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 3.5

July Mean Temperature (Celsius): 14.4

Annual Precipitation (mm): 1114

Height (cm): 150

Perennation - primary


Life Form - primary




Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 2689

Count of 10km squares in Ireland: 932

Count of 10km squares in the Channel Isles: 11

Atlas Change Index: 1.32

Weighted Changed Factor: -2

Weighted Change Factor Confidence (90%)


JNCC Designations


Atlas text references

Atlas (12c)
Grime JP, Hodgson JG, Hunt R
1988.  Comparative Plant Ecology.
Hultén E, Fries M
1986.  Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1972)
Bangerter EB, Cannon JFM, Jermy AC
1978.  Ferns and their allies. The Island of Mull: a survey of its flora and environment. :12.1-12.7.
Meusel H, Jäger E, Weinert E
1965.  Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
Page CN
1997.  The ferns of Britain and Ireland, edn 2.