Dryopteris expansa
Ecology
A deciduous fern found growing in open wet woodland and around rock outcrops at low altitudes, and in damp, sheltered hollows of upland boulder scree. Its substrates are usually mildly acidic, but it can grow in scree derived from quite base-rich mica-schists. 0-945 m (Stob Binnein, W. Perth).
Status
Trends
D. expansa was first mapped by Jermy et al. (1978). Some lowland sites have been lost to woodland clearance, but upland sites are relatively stable. The species is, however, difficult to identify and is almost certainly under-recorded.
World Distribution
Circumpolar Boreal-montane element, with a disjunct distribution.
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Broad Habitats
Light (Ellenberg): 7
Moisture (Ellenberg): 6
Reaction (Ellenberg): 3
Nitrogen (Ellenberg): 2
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 1.7
July Mean Temperature (Celsius): 12
Annual Precipitation (mm): 1772
Height (cm): 80
Perennation - primary
Life Form - primary
Woodiness
Clonality - primary
Count of 10km squares in Great Britain: 247
Count of 10km squares in Ireland: 0
Count of 10km squares in the Channel Isles: 0
Weighted Changed Factor: -61
Weighted Change Factor Confidence (90%)
JNCC Designations
Atlas text references
.
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1972)
.
1997. The ferns of Britain and Ireland, edn 2.