iciv. GENEEA OP FEENS: 



oa the oblique dilated apices of the segments ; the receptacles at 

 the apex of the veinlets i.e. terminal, with usually a longer 

 branch of the veins prolonged past the sorus into the apex of 

 the segments. Indusium sub-herbaceous, broader than long, 

 opening along the truncated mouth, equalling the margin of the 

 frond, and forming therewith a short oblique boat-shaped cavity. 

 Veins single in the narrow ultimate segments, forking below the 

 sorus, the fertile venule very short. 



Fronds sub-coriaceous, opaque, compoundly pinnatifid, the 

 ultimate segments short, narrow, single-veined, soriferous ob- 

 liquely at the apex. Ehizome tufted. A small group dis- 

 tinguished among the Davalliece, by their darseoid structure. 



Ex. : L. eoncinnum, Moore. \ L. gibberosum, Moore. 



L. Schimperi, Moore. \ L. Lindeni, Moore. 



131. PROSAPTIA, Presl, Tent. Pterid. 165. 



DAVALMJB sp., Auct.; POLYPODII sp., J. Smith ; HtmAia! sp., Desvaux; 

 TBICHOMANIS sp., Forster. 



Son indusiate, oblongo-rotundate, immersed in a short marginal 

 cyst, open externally ; the receptacles terminal at the apex of the 

 costa. Indusium sub-coriaceous, continuous with, and scarcely 

 differing from the under surface of the frond, forming an extrorse 

 cavity in, as it were, the substance of the frond itself. Veins 

 simple from a central costa or costseform vein ; the latter usually, 

 and one or two of the upper veins (branches) sometimes, 

 soriferous. 



Fronds pinnatifid, rigid, sub-coriaceous. Ehizome tufted, 

 decumbent. This little group differs from Davallia, in the 

 texture of the indusium being homogeneous with that of the 

 frond j and in the sori being confined, almost always, to the 

 apex of the costa or costasform vein which traverses the centre 

 of the pinnse-like segments. It does not appear to have any 

 relationship with Polypodium, in which it is sometimes placed ; 

 and the structure seems sufficiently different from Davallia to 

 justify its separation from that genus. 



Ex. : P. contigua, Pre,l. \ p. Emersonii, Fred. 



