114 VII. LASTREA. 
TliLs is a rare and local species, entirely confined, as far 
as regards Great Britain, to limestone hills in the mountain- 
ous districts in the counties of Westmoreland, Lancashire, 
and Yorkshire. The Rev. W. Bree first found it at Ingle- 
borough in Yorkshire. The Rev. G. Finder met with it 
in great profusion along the limestone district, between 
Arn.side Knot (near Silverdale, Westmoreland), where it 
is comparatively scarce, and Ingleborough, being most 
abundant on Hutton Roof Crags and Farlton Knot, where 
it grows in the deep fissures of the natural platform, and 
occasionally high in the clefts of the rocks. It is gene- 
rally much shattered by the wind, or cropped by the 
sheep, which seem to be fond of it. It grows abundantly 
in the fissures of limestone rocks, near Settle, in Yorkshire, 
at an elevation of 1,550 feet. It is also recorded as a 
native of various European countries. 
This is an easily managed and elegant plant under 
cultivation, and flourishes well in a shady peat border or 
planted in turfy peat soil, intermixed with small lumps of 
broken limestone. It should not be kept too moist, and 
the crown should be raised above the surface. 
5. Lastrea crlstata, Presl. Crested or Narrow 
prickly-toothed Buckler Fern. Fronds erect, narrow 
linear-oblong or lanceolate pinnate or bipinnate ; serra- 
tures spinose-mucronate ; scales of the stipes ovate scat- 
tered ; indusium without marginal glands : 
[I unite the following forms under one species, because although 
the two extremes are apparently distinct, they are so closely 
connected by the intermediate form (uliginosa) as to be (indistin- 
guishable from one or other of the conditions which the latter 
assumes. In doing this I believe I am recurring to the views 
held by Linnaus. The group thus associated, though readily 
distinguished from the allied group which I regard as varieties 
of the following species, and with which this is associated by some, 
does not appear to me to offer sufficient marks for the specific 
separation of the plants I have assigned to it.] 
