CHECKLIST OF THE FERNS. . 317 



PHEGOPTERIS Fee. 



57. Phegopteris Dryopteris Fee. 



Phegopteris Dryopteris Robert iana Dav. 



Phegopteris Calcarea Fee. 



58. Phegopteris hexagonoptera Fee. 



59. Phegopteris polypodioides Fee. 



Phegopteris Phegopteris Underw. 



POLYPODIUM L. 



60. Polypodium, incanum Sw. 



Poly podium polypodioides Hitchcock. 



61. Polypodium vulgar e L. 



Polypodium vulgare f. Cambricum Willd. 

 Polypodium vulgare /. biserratum Millspaugh. 



Polypodium vulgare oreophilum Maxon. 



Polypodium vulgare deceptum Maxon. 



POLYSTICHUM Roth. 



62. Polystichum acrostichoides Schott. 



Aspidium acrostichoides Sw. 



Dryopteris acrostichoides Kuntze. 

 Polystichum acrostichoides f. incisum Underw. 

 Polystichum acrostichoides /. crispum Clute. 



63. Polystichum Braunii Lawson. 



Aspidium aculeatum Braunii Doell. 

 Dryopteris Braunii Underw. 



64. Polystichum lonchitis Roth. 



Aspidium lonchitis Sw. 

 Dryopteris lonchitis Kuntze. 



PTERIS L. 



65. Pteris aquilina L. 



Pteridium aquilinum Kuhn. 



66. Pteris aquilina pseudocaudata Clutc. 



Pteris aquilina caudata Hook. 



