554 45rt. PTEBIS. § 1. EUPTERIS. b. PI.\?«ATAE. 



i^c.Jtc. Central or highest pinnae largest. Rachis yellowish-greert, 

 naked or slightly scaly. (4a) Pt. longifolia. 



••j'.-f. Veins distant; lower pinnae stalked. (ib) Pt. platysora. 



b.b. Pinnae cuneate at the base. 



c, Rachis pubescent. (5) Pt. opaca. 



c.c. Rachis naked. 



tk Largest lateral pinnae of fully developed fronds more than 

 27% C.M. long. 



X. Fronds middlosissodi Lowest pinnae -S — 3 fwreato t «2^ 

 Sz^r oyvc^ jL>h-k^- (6) Pt. Treubii. 



x.x. Fronds largo. Lowest pinnae simple. (7) Pt. moluccana. 

 d.d. Largest lateral pinnae under 27% c.M. long. 



e. Barren fronds with 3 — 5 pinnae clustered at the apex 

 of the stipe. (8) Pt. stenophylla. 



e.e. Barren fronds with the pinnae not clustered at the apex 

 of the stipe. 



f. Barren pinnae entire or nearly so, at best serrate 

 or toothed towards the apex. 

 g. Lowest pinnae simple or 2-furcate. 



(9) Pt. pellucida. 

 g.g. Lowest pinnae 3-lobate or 3-furcate. 



(10) Pt. papuana. 

 f.f. Barren pinnae more copiously serrate throughout. 



•{•. Stipes stramineous or pale-brown. 



(11) Pt. cretica. 

 ■{•.f . Stipes black. (12) Pt. melanocaulon. 



• (2) Pt. rangifei'ina, J»r., Ann. Mus. Bot. L. B., IV, 95 ; Pt. 



Dalhousiae, Rac. (not Hk.), Flor. Btz., I, 155; Pt. laemgaia, Zipp., MS. in 

 Herb. Bog. • 



Rbizome erect, thick, densely clothed with brownish, tomentose hairs. 

 Stipes 50—150 c.M. long, erect, naked, the outer side convex, the inner 5- 

 sulcate, the base reddish-brown, the rest stramineous. Fronds dimorphous. 

 Barren fronds lanceolate-oblong, 45 — 250 c.M. long, pinnate with + 8 — 12 

 pairs of stalked, erecto-patent pinnae below the terminal one. Terminal and 

 lateral pinnae similar, lanceolate, 15 — 30 c.M. long, 2 — 4 c.M. broad, the 



