160 FERNS: BRITISH AND FOREIGN. 



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. tennis, Schott ; Lowe's Ferns, 7, t. 35. Aspidium tenue, 

 Sw. ; Sclik. Fil. t. 53 B. Aspidium atomarium, 

 Mulil. ; Willd. Cystopteris atomaria, Presl. North 

 America. 



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

 bulbiferum, Linn. Aspidium bulbiferum, Sw. ; Sclik. 

 Fil. t. 57. North America. 



3. C. fragilis, Bernli.; 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, Sm. ; Encj. 

 Bot. 1. 1587. 



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

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

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

 Cyathea dentata, Sm. 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; Lindl. 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. 



