52 HISTORY OF BRITISH FERNS. 



nate, pinnules ovate, acute; sori central. Plate X. 

 fig. 1. 



b. dentata. Pinnules ovate, obtuse, distinct; sori 

 marginal. 



c. Dickieana. Pinnules broad, obtuse, overlapping ; 



sori marginal. 



2. C. alpina, Desvaux. Fronds sub-tripinnate, seg- 



ments linear. Plate X. fig. 2. 



3. C. montana, Link. Fronds triangular. Plate XIV. 



fig. 2. 



C. POLYPODIACE^ ASPLENIE^}. 



vii. ATHYEIUM, Both. 



1. A. Filix-foemina, Both. The only species. Pinnules 

 flat, linear-oblong. Plate XI. 



d. convexum. Pinnules narrow, distinct, linear, 

 convex. 



c. latifolium. Pinnules broad ovate, crowded, irre- 



gularly lobed. 



d. molle. Pinnules oblong, flat, decurrent. 



e. multifidum. Pinnae and frond tasselled at the 



apex. Plate XI. 



f. crispum Dwarf, irregularly branched, with the 

 ends tasselled. 



