NORTHUMBERLAND AND DURHAM, 295 



yards. On the basaltic crags near Belford, 150 yards (T.)., 

 Bavington, Gunnerton, Crag Lough, and Walltown, sparingly, 

 and in South. Tynedale on the banks of the Hartley Burn. In 

 Teesdale and Weardale not unfrequent, ascending to 2000 feet on 

 Stangend Rigg above Allenheads. 



5. CYSTOPTERIS, Bemh. 



1. C. fragilis, Bernh. JSTative. British type. Area C, N, D. 



Range 1, 2. 

 Frequent on walls and rocks amongst the hills, ascending to 

 600 yards in the Cheviot ravines and on the Main Limestone 

 scars of Kilhope and Bleak Law, descending to Castle Eden 

 Dene, Cawsey Dene, and Ravensworth Woods. 



6. POLYSTICHUM, Roth. 



1. P. lonchitis,'Roi\L. Native. Highland type. Area C, D. 

 Range 1, 2. 



Near the railway between Alnwick and Morpeth, at an eleva- 

 tion of under 100 yards above sea-level. In Teesdale on Falcon 

 Clints, 400-450 yards, now nearly or quite extinct. 



2. P. aculeatum, Roth. Native. British type. Area C, N, D. 



Range 1, 2. 

 "Woods and rocky places, frequent, ascending into the Cheviot 

 ravines, and to 600 yards on the Main Limestone scars at Bleak 

 Law. 



3. P. angulare, Newm. Native. English type. Area C, D. 



Range 1. 

 Near Wooler in Humbleton Dene, Akeld Dene, and amongst 

 the crags above the lower part of the Common Burn, 250 yards 

 (James Hardy). Cauledge Woods near Alnwick (W. Richard- 

 son!). Castle Eden Dene (Mrs. 'Kdjclej, fide Moore). 



7. LASTREA, Presl. 



1. L. tlielypteris, Presl. Native. English type. Area C. 



Range 1. 

 Lcarmouth Bog near Cornhill (R. Embleton. T.). 



