AN ENUMERATION Of dttlTlVAlEb FEKttS. 



229 



1. C. offleinarum, Willi. ; Sooh. Gen. Fil. 1. 113 ; Lindl. and 

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

 .a.splenmm Ceterach, Linn. ; Sooh. Brit. Ferns,' t. Sfi. 



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



Grammitis Ceterach, Sw. ; Sclilc. Fil. t. IB; Loild. 

 Sot. Cab. t. 15. Soolopendvium Ceterach, Fng. Lot. 

 1244. — Europe, North India. 



Tjiibe X— DICKSONIE^l. 



Bori marginal, round, or linear and transverse. Indnsium 

 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. 



