160 FERNS: BEITISH AND FOREIGN. 



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

 reniform, cncullate, dentate or fimbriate. 



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



1. C. tenuis, Sclwtt ; Lowe's Ferns, 7, t. 35. Aspidium tenue, 



8w.; Sclik. Fil. t. 53 B. Aspidium atomarium, 

 Mulil. ; Willd. Cystopteris atomaria, Presl North 

 America. 



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



bulbiferum, Linn. Aspidium bulbiferum, Sw. ; Schk. 

 Fil. t. 57. North America. 



3. C. fragilis, Bernh.; Hook. Gen. Fil t. 52 B; Lindl. and 



Moore's Brit. Ferns, t. 46 A, f. 1 ; Sowerby's Ferns, 

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

 Sw. ; Sclik. Fil. t. 54. Cyathea fragilis, 8m. ; Enq 

 Bot. t. 1587. 



Var. dentata, Hook.; Lindl. and Moore's Brit 

 Ferns, t. 46 A,f. 4r, Lowe's Ferns, 7, t. 32. Cysto- 

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

 Cyathea dentata, Sin. Eng. Bot. t. 1588. Poly- 

 podium dentatum, Dicks. 



Var. Dickieana, Moore ; Lindl. and Moore's Brit 

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

 /. 4, 5. Cystopteris dentata, var. Dickieana. Bab 

 Sowerby's Ferns, t. 22. C. Dickieana, Sim.; Lowe's 

 Ferns, 7, t. 33. 



Var. sempervirens, Moore; Lmdl. and Moore's 

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



Var. angustata, Link ; Moore's "Nat. Print. Ferns 

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

 Temperate Eegions of the Northern Hemisphere. 



