Dryopteris expansa

Tracheophyta PteropsidaDryopteridaceaeDryopterisDryopteris 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

Native

World Distribution

Circumpolar Boreal-montane element, with a disjunct distribution.

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

Perennial

Life Form - primary

Hemicryptophyte

Woodiness

Herbaceous

Clonality - primary

Little or no vegetative spread

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%)

39

JNCC Designations

NHMSYS0000458190