AN ENUMERATION OP CULTIVA1ED FERNS. 229 



1. C. officinanim, Willd.; Hook. Gen.Fil 1. 113; Lindl.and 

 Moore's Brit. Ferns, t. 43 A ; Lowe's Ferns, 5, t. 54. 

 Asplenium Ceteracli, Linn. ; Hook. Brit. Ferns, t. 36. 



Genus 117. Frond natural size, and portion enlarged. No. 1. 



Grammitis Ceterach, Sw. ; ScTik. Fil. t. 7 B ; Lodd. 

 Bot. Cab. t. 15. Scolopendrium Ceterach, Eng. Bot. 

 1244. Europe, North India. 



TRIBE X. DICKSONIE.3S. 



Sori marginal, round, or linear and transverse. Indusiwn 

 lateral, interiorly attached, its extrorse margin free and con- 

 niving more or less with the changed margin of the frond, which 

 becomes an accessory indusium, the two forming a cucullate or 

 bivalved round cyst, or elongated grove, containing the sporangia. 



