S56 45a. PTERis. § 1. euptems. b. pinnatae. 



acuminate, entire or serrulate when barren, + 3 — 12 m.M. broad, truncate 

 or cordate, sometimes slightly auricled at the base; lower pinnae gradually 

 dwarfed. Texture subcoriaceous ; rachis naked or slightly scaly; surfaces 

 naked; veins close, mostly once forked. Indusium narrow, membranaceous. 



Var. diver sifolia : Fronds narrowed gradually towards the base; 

 the lowest pinnae reduced, roundish or oblong, the highest the longest. United 

 to the type by intermediate forms. 



Tropical and subtropical, everywhere. 



(46) Pt. platyisora, nu., Journ. of Bot., XVIII, 211. 



Stipes 60 — 90 c.M. long, naked, stramineous upwards, «astaneous towards 

 the base. Fronds 45 — 60 c.M. long, + 15 c.M broad, oblong-lanceolate, 

 simply pinnate. Pinnae ± 25, simple, linear, erecto-patent, the lower dis- 

 tinctly stalked, 12—15 c.M. long, 6—9 m.M. broad, entire, 5—8 c.M. apart, 

 the upper sessile, the terminal one like the others. Texture moderately firm; 

 surfaces naked ; veins distant, simple or forked. Sori continuous, not reaching 

 the apex of the pinnae; indusium broad and distinct, but hidden when the 

 fruit is fully developed. — Near Pt. longifolia, L. 



Sumatra^ 



(5) Pt. opaca, J. Sm., Hk. Bk., Syn. Fil., 154; Hk., Spec. Fil., II, 

 tab. CXIV, A. 



Stipes strong, erect, pale-coloured, finely pubescent like the rachis. Fronds 

 60 — 200 c.M. long, oblong. Pinnae in numerous + opposite pairs, linear, 

 cuneate at the base, the edge quite entire towards the po int, the largest + 

 30 c.M. long, + 1 — I'/j c.M. broad. Texture coriaceous; surfaces naked 

 except on the midribs beneath; veins sunk in the frond and only visible as 

 faint striations. Indusium narrow, brownish. 



Celebes, Batjan, Philippines. 



* (6) Pt. Treubii, r. A. ». jr. 



Stipes + 20 c.M. long, brownish and naked like the rachis. Fronds 

 30 — 45 C.M. long, pinnate. Terminal pinna linear, 20 — 30 c.M. long, + 5 

 m.M. broad, the base gradually narrowed, the edge entire, the apex acuminate, 

 spinuloso-denticulate. Lateral pinnae 3 — 4 on each side, erecto-patent, similar 

 to the terminal one, the highest ones simple or forked at the base, the lowest 

 the longest, to 40 c.M. long, + 5 m.M. broad, stalked, 2— 3-partite, 

 the stalks + I'/j— 2 c.M. long; segments k the divided pinnae as long, 



