314 The Flora of Wiltshire. 



2. P. annulare, (Newm.) angular-leaved Shield Fern. N. 

 173. Aspidium, Sm. Ungl. Bot. Suppl. t. 2776. A. aculeatmn, 

 Kunze. 



Locality. Woods and hedge-banks, on a gravelly soil. P. Fl. 

 Juli/, August. Area, \, 1, 3, 4, 5. Distributed less widely than the 

 ipreceding, hut locally more plentiful. Fronds lax, drooping, lanceolate, 

 bipinnate. Pinnules distinctly stalked, with an obtusely-angled 

 base, more or less obtuse at the apex, spinose-serrate. Rachis 

 usually long. The differences between this and P. aculeatum are 

 sufficiently striking where the contrast is made with the extremer 

 forms of each, the habit of this is flexile and drooping, the leafy 

 texture not so firm, the upper basal pinnules somewhat crescent- 

 shaped, auriculate on the upper side, and attached to the partial 

 rachis by a very distinct slender stalk, instead of being decurrent. 



CysTOPTERis, (Bernh.) Bladder-Fern. 

 Linn. CI. xxiv., Ord. i. 

 Named from {Jcustis) a bladder, and {pteris) a fern, in i.llusion to 

 the peculiar character of the indusium. 



1. C. fragilis, (Bernh.) brittle Bladder-Fern. Neivm. ed. 3, p. 

 87. Cystea fragilis, Sm. 



Locality. Rocks and walls, preferring the moist crevices of 

 limestone. P. Fl. Juli). Area, * * 3, 4, * 

 South Division. 



3. South-west District. Walls at Fon thill Giffbrd, and at Norton 

 Bavant. 



North Division. 



4. North-west District. Rocks above Bathford, Monkton Farleigh 

 Down, and at Box Quarries. " Walls near the Horse and Jockey, 

 Dr. Alexander Prior, " Flor. Bath." Very local in Wilts. Fronds 

 lanceolate, bipinnate, (or rarely pinnate) Pinnae ovate or ovate- 

 lanceolate, pinnules variously toothed, or laciniate, or pinnatifid. 

 The segments approximate, entire, or again toothed. Rachis winged. 

 Clusters rarely confluent, generally crowded at a little distance from 

 the margin. The fronds vary in height from 2 to 3 inches to 1 

 foot or more, and differ much in form and division. 



