Atlas Of Ferns Of The British Isles

32 ADIANTACEAE
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11.1
CRYPTOGRAMMA
CRISPA
Parsley Fern
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11.1 Cryptogramma crispa (L.) Hook.
An arctic-alpine species restricted to calcium-free siliceous soils
and rock screes. Absent from such habitats in the west where
these are enriched with base-rich cations from salt-laden winds.
A very local plant in Ireland. A.P.Conolly & E.Dahl (in
D.Walker & R.West (eds.), Studies in the vegetational history
of the British Isles: 196; 1970) _correlate the present-day
distribution of this species with the 24°C maximum summer
temperature summit (i.e. for the highest places in the landscape)
isotherm for Ireland and Highland Scotland and the 26°C
isotherm for Wales, England and Lowland Scotland.
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