A. viride is an evergreen fern of moist, sheltered crevices in basic rocks, and very rarely also on mortared walls. It is occasionally a colonist of old metal mine workings. From sea level on the coasts of W. Britain and Ireland to 975 m on Ben Lawers (Mid Perth).
This species shows no appreciable change in distribution since the 1962 Atlas. Because of its requirement for an environment which is cool and humid in summer (Page, 1997), its occasional occurrences in lowland C. and E. England have all been short-lived.
Circumpolar Boreal-montane element, with a disjunct distribution.
Light (Ellenberg): 4
Moisture (Ellenberg): 5
Reaction (Ellenberg): 8
Nitrogen (Ellenberg): 3
Salt Tolerance (Ellenberg): 0
January Mean Temperature (Celsius): 2
July Mean Temperature (Celsius): 12.8
Annual Precipitation (mm): 1701
Height (cm): 20
Perennation - primary
Life Form - primary
Clonality - primary
Count of 10km squares in Great Britain: 435
Count of 10km squares in Ireland: 43
Count of 10km squares in the Channel Isles: 0
Atlas Change Index: -0.21
Weighted Changed Factor: -24
Weighted Change Factor Confidence (90%)
Atlas text references
1986. Atlas of north European vascular plants north of the Tropic of Cancer. 3 vols.
Jalas & Suominen (1972)
1978. Ferns and their allies. The Island of Mull: a survey of its flora and environment. :12.1-12.7.
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1997. Asplenium viride Hudson (Aspleniaceae) in Greater London. Watsonia. 21:376-378.