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The sides of mountains with a dry soil are clothed to a moderate
elevation with Brackens, Pteris aquilina, which, by their
changing in September and October from a bright to an olive
green, and afterwards to a russet brown, contribute to that
autumnal colouring which is so much admired. The Stone fern,
Pteris crispa, (Cryptogramma of Hooker) inhabits
higher and more rocky situations. Asplenium
Adiantum-nigrum is rooted in Castlehead rock, and near Low
Wood Inn. Hart's tongue, Scolopendrium vulgare, in rents
of limestone rocks in Westmorland, and at Calder Bridge;
Scolopendrium Ceterach (Grammitis of Hooker) on
Troutbeck Bridge. Osmund royal, Osmunda regalis, in
Ullock-moss near Keswick, at Skelwith and Loughrigg.
In a walk round Castlehead and Cockshot near Keswick, may be seen
Polypodium vulgaris; Aspidium Filix-mas,
Oreopteris and dilatatum; Asplenium
Filix-faemina, and Trichomanes; and Blechnum
boreale. Aspidium lobatum, Barrow Cascade;
Asplenium Ruta-muraria, at Hill Top near Keswick;
Hymenophyllum Wilsoni, at Barrow, Dungeon Gill, and Scale
Force; Polypodium Phegopteris, Patterdale, Wythburn, and
Scale Force; P. Dryopteris, in Borrowdale; Cistopteris
fragilis, Wanthwaite Crags, and Horse-troughs near Kendal.
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