160 PEENS: BEITISH AND POEEIGN. 



tiform, medial. Sori round. Indusium. lateral,, oblong or 

 reniform, cucullate, dentate or fimbriate. 



Genus 76.— Portion of fertile frond, under side. No. 3, var. 



1. C. tenuis, Schoii ; Lowe's Ferns, 7, t. 36. Aspidium tenue, 



Sw. ; Bchh. Fil, t. 63 B, Aspidium atomarium, 

 Muhl. ; Willd. Oystopteris atomaria, Presl. — North 

 America. 



2. C. bulbifera, Bernh. ; Lowe's Ferns, 7, t. 36. Polypodium 



bulbifenim, Linn. Aspidium bulbiferum, 8w. ; Sehh. 

 Fil. t. 57. — Nortb America. 



3. C. fragilis, Bernh. ; Sooh. Qen. Fil. t. 52 B ; Lvndl. and 



Moore's Brit. Ferns, t. 46 A, f.l; Sowerby's Ferns, 

 t. 19. Polypodium fragile, Linn. Aspidium fragile, 

 Sw. ; Salik. Fil. t. 54. Cyathea fragilis, 8m. ; Eng. 

 Bot. t. 1687. 



Vwr. dentata, Sook.; Limdl. amd Moore's Brit. 

 Ferns, t. 46 ^, /. 4 ; Lowe's Ferns, 7, t. 32. Cysto- 

 pteris dentata, Hook. ; Bowerhy's Ferns, t. 21. 

 Cyatbea dentata, Bm. Fng. Bot. t. 1588. Poly- 

 podium dentatum, Dicks. 



Va/r. Dicldeana, Moore ; Limdl. and Moore's Brit. 

 Ferns, t. 46 A, /. 5, 6 ; Soak. Brit. Ferns, t. 23, 

 /. 4, 5. Oystopteris dentata, var. Dickieana, Bah. ; 

 Bowerhy's Ferns, t. 22. 0. Dickieana, Bim.; Lowe's 

 Ferns, 7, t. 33. 



Va/r. sempervirens, Moore; Limdl. amd Moore's 

 Brit. Ferns, t. 46 A,f. 2, 3. 



Va/r. angustata, Link ; Moore's Wat. Print. Ferns, 

 Oct. Ed. 2, t 102 C; Bowerhy's Ferns, t. 20.— 

 Temperate Regions of the Northern Hemisphere. 



