568 4oa. pteris. § 1. eipteris. c*. bipinnatifidae. 



Texture moderately firm; surfaces naked; rachises dark-coloured; veins copi- 

 ous. Sori nearly reaching the apex of the segments; indusium narrow, 

 naked. 



Borneo^ 



* (28) Pt. decuissata, J. Sm., Journ. of Bot., Ill, 405 ; Pi. patens, 

 Hk., Hk. Bk., Syn. Fil., 165; Hk., Spec, Fil., II, tab. CXXXVII; Bedd., Ferns 

 S.I., tab. CCV. 



Stipes tufted, stout, scaly at the base, glossy, rather dark-brown. Fronds 

 large, 90 — 120 c.M. long, 60 c.M. broad or broader. Terminal pinna 15 — 25 

 c.M. long, S'/j — 7 '/a '^•^^- hroad, with several, + horizontally spreading, linear 

 lobes on each side reaching down nearly or quite to the costa, dilated sud- 

 denly on both sides at the base, the barren ones slightly serrate or crenate. 

 Lateral pinnae numerous, similar to the terminal on but longer, sometimes 

 45 c.M long, to 5 c.M. broad, the lowest forked. Texture thinly coriaceous ; 

 rachis and both surfaces naked; veins oblique, the lowest sometimes anasto- 

 mosing (Christ, Farnkr. d. Erde, 168), commonly once forked. Sori continued 

 nearly to the end of the segments. — I am sceptical to the anastomosing of 

 the veins. A plant gathered in Borneo by Hallier and determined by Christ 

 as Pt. paiens, Hk., (Ann. Btz., XX, 1 50) has the fronds smaller, the veins quite 

 free and the costae purveyed with 2 interrupted, nairow wings on the upper 

 side. (See Bedd., Handb. Ind. Ferns, 114, line 5 from bottom). 



Malacca, Borneo, Celebes, Philippines; Ceylon, Samoa, Society-Islands 



(29) Pt. l¥alkeri, «k., Journ. of Bot., XXVI, 324. 



Stipes naked, castaneous, 15 — 20 c.M. long. Fronds rhomboidal, irregu- 

 larly 5-pinnate, ± 30 c.M. long. Pinnae usually caudate, terminal and high- 

 er ones simply pinnate, several lower forked at the base. Ullimate segments 

 obtuse, at /utmost + 2 c.M. long, + 2 m.M. broad. Texture moderately 

 firm; surfaces naked; rachises castaneous; veins copiously pinnate in the ul- 

 timate segments; veinlets indistinct. Sori occupying nearly the whole margin 

 of the segments; indusium narrow, naked. 



Borneo. 



* (30) Pt. excelsa, Ga^d., Rac, Flor. Btz., I, 155; Hk., Spec. 

 Fil, n, tab. CXXXVI; Bedd., Ferns Br.I., II, tab. CCXVIH. 



Rhizome erect, short, densely clothed with narrow, lanceolate, brown 

 scales. Stipes tufted, naked, erect, stout, reddish, greenish or pale-brown, to 



