PTERIDE^E PTERIS. 103 



times 45 cm. long, 5 cm. broad, the lowest forked, scarcely coriaceous, 

 glabrous; veins oblique, not conspicuous, usually forked, sori reaching 

 nearly to the end of the segment. I am sceptical as to the anastomosing 

 of the veins. 



Luzon, Cuming 103; Davao, Warburg 14123. 



Himalayas to Japan and Polynesia. 



(15) P. biaurita L. Stipe 30 to 60 cm. high, strong, erect, naked, stram- 

 ineous; frond with a terminal pinna 15 to 30 cm. long, 3 to 5 cm. broad, 

 cut down within about 5 mm. of the rachis into numerous spreading linear- 

 oblong lobes; lateral pinnae several pairs, similar to the terminal one, the 

 lowest rather remote and usually once forked, segments entire, obtuse, 

 papyraceous or subcoriaceous, glabrous ; veins evident, forming single 

 areolas along the costa of the pinna but entirely free in the segments. 



Rizal, Uarave 130. 



Pantropic. 



P. armata Presl. "Fronds cordate-ovate glabrous glaucescent pinnate, 

 pinnae opposite sessile pinnatifid lowest ones bipartite, segments linear 

 obtuse entire unequal, terminal one elongate, repand, secondary rachises 

 and costa above spinose, stipes smooth." This is probably P. quadriaurita 

 var, setigera, fitting perfectly with the plant from Arayat. 



Sorsogon, Haenke. 



(16) P. kleiniana Presl. Total height 2 m.; frond pedately ovate, 

 pinnate; pinnae broadly lanceolatej long-caudate, deeply pinnatifid into 

 subfalcate segments, crenate where sterile, submembranaceous ; sori falling 

 well short of the apex of the segments; otherwise like P. biaurita, with 

 which Hooker and Baker unite it. 



Cagayan-Luzon, Warburg 11617, 12202. 

 India. 



(17) P. wallichiana Agardh. Stipe about 15 cm. high, strong, naked, 

 glossy, bright chestnut brown; frond tripartite with lateral divisions 

 again forked, the central often 60 cm. long, 30 cm. broad, with numerous 

 lanceolate, sessile, opposite pinnules, the largest of which are 15 cm. long, 

 2 cm. broad, cut down within about 2 mm. of the costa into numerous 

 contiguous linear-oblong lobes, the sterile ones nearly entire, herbaceous, 

 glabrous; lateral pinnae nearly as large as the terminal one; veins not 

 conspicuous, forming single areolse along the costa between the main 

 veins, rarely another areola at the base of the main vein; sori continuous 

 along nearly the entire margin. 



Luzon, Cuming 204, Lobb 481. ,' 



Himalayas to Samoa. 



(18) P. tripartite Sw. Stipe 30 to 100 cm. or more high, strong, erect, 

 naked, polished, stramineous or brownish, like the rachises ; frond tripartite, 

 the central part 60 cm. or more long; terminal pinna 15 to 25 cm. long, 15 

 to 30 mm. broad, cut deeply into numerous close, linear or oblong lobes, 

 which are subfalcate and slightly toothed where sterile, herbaceous, glab- 

 rous; lateral pinnae numerous, close, all unbranched; lateral divisions 

 similar, but shorter and usually branched; veins fine, anastomosing chiefly 

 along the costa and main veins, sori not reaching the apices of the segments. 



