1G0 
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. tenuis, 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, Bernh. ; Lowe’s Ferns, 7, t. 36. Polypodium 
bulbiferum, Linn. Aspidium bulbiferum, Sw. ; Sclik. 
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, Sm. ; Eng. 
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, f. 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 Regions of the Northern Hemisphere. 
