162 FEKNS : BRITISH AND F0KE1GU. 



. § 1. Woodsia vera. Stipes with a special articulation.. 

 Membrane of indusium nearly obsolete, fringed with articulated 

 hairs, which involve the sporangia. - 



1. W. Ilvensis, B. Br.; Hook. Brit. Ferns, I. 8; Eng. Bet. 



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

 Brit. Ferns, t. 47 A. Acrpstichum Ilvense, Linn. 

 Polypodium. Ilvense, Sio. ; Schh. Fil. t. 19. — Europe, 

 Britain. T. 



2. W. byperborea, B. 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 ; Schh. Fil. t. 17 B— Europe, 

 Britain. T. 



§ 2. Fhysematium. Stipes not articulated. Membrane of in- 

 dusium complete, at length somewliat sinuose-laciniated. 



3. "W. polystich.oid.es, Eaton; Hook. 2nd Cent. Ferns, t. 2. 



/3 Veitchii, Hook. Gara. isms, t. 32. Woodsia 

 Veitchii, Hance, MSS. — Japan, Manchuria. 



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



Ferns, 7, t 29. Polypodium cbtnsum, Sw. ; Schh. 

 Fil. t. 21. "Woodsia Perriniana, Hooh. 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 Mexicana, 

 B Br.— Mexico. H. 



§ 4. Arlhropterce. Fronds always pinnate; pinnae entire 

 or .subpinnatifid, always articulated with tlie rachis. Sori 

 punctiform, terminal. Indusium renifonn, rarely obsolete or 

 wanting. 



78 ARTHROPTERIS, /. Sm. 



Vernation uniserial, distant ; sarmentum slender, scandent; 

 stipes pseudo-articulated; the node of articulation basal 

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



