FILICES. 253 



958. P. Robertianum, Ho/m. Limestone Polypody, 



Native ; on limestone, rare and local. 



In Leigh Wood, rare. Shierclifs Guide, 1789. We 

 understand that before the construction of the 

 Suspension Bridge and its approaches, the high 

 ground on the Leigh side, above Nightingale Valley, 

 was covered with heath, sand, and loose stones ; 

 and that P. Robertianum grew among the latter. 

 Plentiful at Cheddar. Brockley. Burrington. 

 Cleeve. Ebbor Gorge ; Miss Livett. V. VIII. 



LASTR/EA, Presl. 



959. L. Thelypteris, Presl. Marsh Fern. 



Native ; in wet peat bogs, very local. 



S. Once seen in a boggy spot between Portishead 

 and Clevedon ; Mr. R. V. Sherring. Abundant on 

 the peat-moors at the southern limit of the dis- 

 trict. VII. VIII. 



960. L. Oreopteris, Presl. Sweet Mountain Fern. 



Native; in woods and about heaths and commons, 

 rather rare. 



Gr. Conham ; Herb. Stephens. Henbury ; Herb. 

 Powell. 



S. Sparingly in Leigh Wood ; Mr. S. Bootsey ; Dr. 

 Thwaites; and Mr. T. B. Flower. Ashton Manor 

 Woods; Miss Atwood; Swete, Fl. 96. Portbury. 

 Two or three plants in Norton's Wood, by Cleve- 

 don ; Mr. R. V. Sherring. A great many in a small 

 combe between Cleeve and Brockley. In some of 

 the combes of Blackdown. On Mendip near Cran- 

 more Tower, where the old red sandstone occurs ; 

 Dr. H. F. Parsons. VII. 



