IXXX. GENERA OF FEHNS : 



a dichotomous costa when tlie segments are confluent ; or (2) 

 longitudinally uniserial on each side a central costa in the ulti- 

 mate segments, when more distinct. Venation diverse : (1) in the 

 more confluent species, the costa dichotomo-flabelliform with 

 the veins prominent, transversely anastomosing, the venules and 

 veinlets (several series) thickly anastomosing, the ultimate or 

 penultimate soriferous, the ultimate branches often free dilated 

 at the apex ; or (2) in the more distinctly divided species, costa 

 central, the veins and venules irregularly anastomosing, with 

 divaricate free sterile veinlets. 



Fronds binate, digitato-palmately-lobed, or repetito-dichoto- 

 mously partite, elongately stipitate, coriaceous. Rhizome woody 

 creeping, the fronds adherent, or not readily separable. So 

 remarkable and peculiar in habit, that, relying partly on the 

 oligocarpous sori, we have kept it distinct from our Pleopeltis, 

 with which, in company with Drynaria, it is technically allied. 

 The central position of the costa in one species, which might 

 thus appear to be anomalous, is to be explained by the smaller 

 size narrowness and more complete separation of its lobes. 



Eudipteris. Costa dichotomously-branched in the ultimate divisions. 

 Ex. : D. conjugata, Seinw. \ D. WaUichii (Polypodium, JR. SrJ 



Pseudodipteris. Costa simple central in the ultimate divisions. 

 Ex.: D. Lobbiana (Polypodium, Hook.) 



112. LECANOPTEBIS, Slume, Enum. Fil. Java, 120. 

 ONTCHIUM, Beinwardt, (non 



Sori non-indusiate, sub-rotund, immersed in the concave or 

 cupuliform cartilaginous (and when dry reflexed) marginal teeth ; 

 the receptacles broadly oval-orbicular. Veins pinnate from a 

 central costa ; venules anastomosing in very irregular elongate 

 hexagonoid areoles, the veinlets free, divaricate straight or 

 hamate, included. 



Fronds coriaceous pinnatifid ; the segments ovato-sub-rotund, 

 (by the reflexion of the lobes oblong), inciso -dentate, Rhizome 

 thick fleshy. Of this fern we have no knowledge. 



Ex. : L. carnosa, Blume. 



