Atlas Of Ferns Of The British Isles

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27.10 Dryopteris expansa (C.Pres1) Fraser-Jenkins & Jermy
(D.assimilis S.Walker)
Most of the populations recorded show the distribution pattern
of an arctic-alpine species. The taxon was first recognized by
Thomas Moore as Lastrea dilatata var. alpina from Ben
Lawers. It also grows, however, at sea-level in oak woodlands
on the west coast of Scotland and this form (morphologically inseparable
from the alpine form) may represent a more southern
genotype which may yet be found in Ireland. (See J.A.Crabbe,
A.C.Jermy & S.Walker, Watsonia, 8: 3-15; 1970).
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