ALLOSORUS — ^LASTREA. 
Allosorus CPispus Bernh. Native. Montane. Area 
9873. Range 300-800. Not unfrequent upon the grit- 
stone edges of the western hills. In Teesdale descending 
to Lonton, ascending to the Main Limestone of Micklefell. 
In Lunedale upon crags near the Tarn. In Swaledale, in 
Whitstondale, and on Raven's Seat moor and the northern 
slope of Lovely Seat. In the Yore district in several stations ; 
Leyburn moor, Penhill, Great Whernside, &c. On the east 
upon the sandstone crags of Wainstones. 
Cystopteris fragilis Bernh, including dentata and angtis- 
iata. Native. Area 987632. Range 0-800. Frequent 
upon rocks and walls amongst the hills, especially those of 
the west and of the Middle Oohte, ascending to the Main 
Limestone of Micklefell, and the limestone pavement of 
Camfell and Widdale fell. In the Central Vale on walls at 
Thornton-le-street. 
Aspidium aculeatum Swartz. Native. Area general. 
Range 0-800. Common in shaded and rocky places, ascend- 
ing to the Main Limestone of Micklefell. 
A. angulare Smith. Native. Area 8765432. Range 
0-300. Frequent in similar situations to the preceding 
throughout the Lower zone. 
Lastrea Thelypteris Presl. Native. Area 6 4 3. Range 
o-ioo. Rare in swampy woods in the low country. Plentiful 
in Askham bogs and Terrington carr, and on Buttercrambe 
moor. It grew formerly in Holly hill bogs near Castle 
Howard, and is reported by Archdeacon Peirson from 
Danbydale. 
L. Oreoptepis Presl. Native. Area 9 8754321. 
Range 0-550. Frequent upon heaths, especially amongst 
the hills, ascending to Cronkley scars, from the commons 
at Stockton and Strensall. 
L. Filix-mas Presl. Native. Area general. Range 0-800. 
Jan. 1905. 
