162 FERNS I BRITISH AND FOREIGN. 



1. Woodsia vera. Stipes with a special articulation. 

 Membrane of indusium nearly obsolete, fringed with articulated 

 hairs, which involve the sporangia. 



1. "W. Ilvensis, R. Br. ; Hook. Brit. Ferns, t. 8 ; Eng. Bet. 



t. 2616 ; Soiverby's Ferns, t. 5 ; Lindl. and Moore's 

 Brit. Ferns, t. 47 A. Acrostichum Ilveiise, Linn. 

 Polypodium Ilvense, Sw. ; Schk. Fil. t. 19. Europe, 

 Britain. T. 



2. W. hyperborea, U. Br. in Trans. Linn. Soc. 11, t. 11 ; 



Hook. Gen. Fil. t. 119 ; Hook. Brit. Ferns, t. 7 ; 

 Sowerby's Ferns, t. 6. Polypodium hyperboreum, 

 Sw. ; Eng. Bot. t. 2023 ; Schk. Fil. t. 17 B Europe, 

 Britain. T. 



2. Physematium. Stipes not articulated. Membrane of in- 

 dusium complete, at length somewhat sinuose-laciniated. 



3. W. polystichoid.es, Eaton; Hook. 2nd Cent. Ferns, t. 2. 



/3 Veitchii, Hook. Gard. Ferns, t. 32. Woodsia 

 Veitchii, Hance, MSS. Japan, Manchuria. 



4. "W. obtusa, Hook.; Hook. Gard. Ferns, t. 43; Lowe's 



Ferns, 7, t. 29. Polypodium obtusum, Sw. ; Schk. 

 Fil. t. 21. Woodsia Perriniana, Hook, et Grev. Ic. Fil. 

 t. 68. North America. 



5. W. mollis, J. Sm. ; Lowe's Ferns, 7, t. 26. Physematium 



molle, Kunze, Anal Pterid. t. 27. Woodsia Mexican a, 

 R. Br. Mexico. H. 



4. Arthropterce. Fronds always pinnate ; pinnce entire 

 or subpinnatifid, always articulated with the rachis. Sori 

 punctiform, terminal. Indusium reniform, rarely obsolete or 

 wanting. 



78 ABTHROPTEEIS, J. Sm. 



Vernation uniserial, distant ; sarmentum slender, scandent; 

 stipes pseudo-articulated; the node of articulation basal 

 or more or less elevated. Fronds pinnate, 1-1| foot long ; 



