FLORA OF BUCKS COUNTY, PFNNSYLVANIA. 



Subkingdom PTERIDOPHYTA. 



Order i. FILICALES. 

 Family i. Ophioglossaceae Presl. 



Ophioglossum vulgatum L. Adder's-tongue. Durham, J. A. & H. F. Ruth; Sole- 

 bury, Miss A. B. Williams; Tullytown, Joseph Crawford. 

 Botrychium obliquum Muhl. Oblique-leaved Grape-fern. Rockhill. 

 Botrychium dissectum Spreng. Cut-leaved Grape-fern. Rockhill. 

 Botrychium Virginianum (L) Sw. Virginia Grape-fern. In rich woods. 



Family 2. Osmundaceae R. Br. , 



Osmunda rcgalis L. Royal Fern. In marshy woods. 

 Osmunda cinnamomea L. Cinnamon Fern. In wet places. 

 Osmunda Claytoniana L. Clayton's Fern. In moist woods. 



Family 3. Schizaeaceae Reichenb. 



Lygodium palmatum (Bernh.) Sw. Climbing Fern. Near Newtown, Dr. Susan 

 Parry; Yardley, L. L. Smith. 



Family 4. Polypodiaceae R. Br. 



Polypodium vulgarc L. Polypody. Frequent on rocky banks. 



Adiantum pedatum L. Maiden-hair Fern. In rocky woods. 



Pteridium aquilinum (L.) Kuhn. Bracken. In sunny places. 



Pellaea atropurpurea (L.) Link. Purple-stemmed Cliff-brake. Nockamixon; Dur- 

 ham, J. A. & H. F. Ruth. 



Cheilanthes lanosa (Michx.) Watt. Hairy Lip-fern. Near Pipcrsvillc; Lumber- 

 ville, (M. C); Neshaminy, I. C. Martindale. 



Woodwardia Virginica (L.) J. E. Smith. Virginia Chain-fern. Bristol, Elias Dif- 

 fenbaugh; Tullytown, Joseph Crawford. 



Woodwardia areolata (L.) Moore. Net-veined Chain-fern. Bristol, Elias Diffen- 

 baugh; Tullytown, Joseph Crawford. 



Asplenium platyneuron (L) Oakes. Ebony Spleenwort. On rocks. 



Asplenium Trichomanes L. Maiden-hair Spleenwort. On rocks. 



Asplenium Ruta-muraria L. Wall Rue Spleenwort. Durham, J. A. & H. F. Ruth. 



Asplenium acrostichoides Sw. Silvery Spleenwort. Frequent in rich woods. 



Asplenium Filix-foemina (L) Bernh. Lady-fern. In woods. 



Camptosorus rhizophyllus (L.) Link. Walking Fern. Rockhill; Harr's dam; 

 Argus; Nockamixon. 



Polystichum acrostichoides (Michx.) Schott. Christmas Fern. In woods and rocky 

 places. 



