﻿45a. PTERis. 373 



§ 5. LITOBROCHIA. 



1. Fronds simply pinnate; pinnae entire. (40a) Pt. Warburgii. 



(406) Pt. finisterrae. 

 1.1. Fronds pinnate; pinnae pinnalifid, the lowest ones not much longer than the 

 next higher ones, whether or not forked at the base. 



2. Indusium inconspicuous. (41) Pt. microdiclyoii. 



3.2. Indusium distinct. 



3. Fronds to + 60 c.M. long; lowest pinnae not forked at the base. 



(42) Pt. Junghuhnii. 



3.3. Fully developed fronds more than 60 c.M. long ; lowest pinnae 



forked at the base. (43) Pt. Milneana. 



1.1.1. Fronds 3-partite; branches similarly 2-pinnatifid, the lateral ones sometimes 



nearly as long as the central one, whether or not forked al the base on 



the lower side, and if so the secondary branches not rarely forked again ['). 



(44) Pt. tripartita. 



(40fl) l»t. 1¥arburgii, Christ, Warb., Mons., I, 70. 



Stipes 45 c.M. or more long, canaliculate in the higher part, naked, 

 stramineous. Fronds large, ovate, probably + 100 c.M. long or longer, + 

 40 c.M. broad, simply pinnate. Pinnae distant, ± 4 c.M. apart, ligulate- 

 linear, as long, entire, long-acuminate, adnate at the base, the lower ones 

 free, not reduced, the higher decurrent so as to form a broad wing to the rachis, 

 the longest + 24 c.M. long, ± 2 c.M. broad. Texture herbaceous or mem- 

 branaceous ; surfaces naked ; costae prominent ; no main veins ; areolae num- 

 erous, hexagonal-oblong, in 5—4 rows; no free veinlets. Sori reaching nearly 

 the apex. — - Sterile fronds smaller, with the apex pinnatifid, the pinnae to 

 ± o'/j c.M. broad. 



Moluccas, New Guinea. 



(40ft) Pt. finiiiterrae, nst., Fed., Rep., V, 37. 



Rhizome and stipes unknown. Fronds elongate-ovate, to 60 c.M. long or 

 longer, to 30 c.M. broad, pinnate at the base, pinnatifid towards the apex. 

 Lowest pinnae o— 10 c.M. apart, sometimes more approximate, shorl-slalked, 

 forked at the base on the lower side, the 1 — 5 following pinnae decurrent. 



(*) See also Pt. heterophlebia, Kze, 



