Dryopteris oreades

Tracheophyta PteropsidaDryopteridaceaeDryopterisDryopteris oreades


This deciduous fern grows in colonies on well-drained rocky ledges, steep, loose scree slopes and in gullies. Substrates include relatively acidic sandstones, slates and mica-schist. It is very sensitive to grazing, often becoming confined to inaccessible ledges and unstable scree slopes in heavily grazed areas. From 105 m (Llyn Padarn, Caerns.) to 850 m (An Sgurr, Mid Perth and Coire na Creiche, N. Ebudes).



World Distribution

Suboceanic Boreal-montane element.

© K.J. Walker, BSBI

Broad Habitats

Light (Ellenberg): 7

Moisture (Ellenberg): 5

Reaction (Ellenberg): 2

Nitrogen (Ellenberg): 2

Salt Tolerance (Ellenberg): 0

January Mean Temperature (Celsius): 1.9

July Mean Temperature (Celsius): 12.6

Annual Precipitation (mm): 1810

Height (cm): 50

Perennation - primary


Life Form - primary




Clonality - primary

Little or no vegetative spread

Count of 10km squares in Great Britain: 308

Count of 10km squares in Ireland: 5

Count of 10km squares in the Channel Isles: 0

Atlas Change Index: 0.24

Weighted Changed Factor: -35

Weighted Change Factor Confidence (90%)


JNCC Designations


Atlas text references

Atlas (11c)
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.
Page CN
1997.  The ferns of Britain and Ireland, edn 2.