45a. PTERis. 575 



§ 3. LITOBROCHIA. 



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



* (406) Pt. finisterrae. 



±.1. Frond» pinnate ; pinnae pinnalifid, the lowest ones not much longer than the 

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



3. Indusium inconspicuous. (41) Pt. microdifclyon. 



3.3. Indusium distinct. 



3. '■' Veins anastomosing sparingly; costular areolae few or 

 wanting. (42) Pt. Junghuhnii. 



3.3. Veins anastomosing copiously; costular areolae many. 



(43) Pt. Milneana. 

 1.1.1. Fronds 3-parlite; branches similarly ^pinnatifid, the lateral ones sometimes 



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

 the lower side, and if so. the secondary branches not rarely forked again (*). 



(44) Pi. tripsH-tita. 



(40a) Pt. l¥arbui*gli, ChrUt, Warb., Mons., I, 70. 



Stipes 43 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 3 — 4 rows; no free veinlets. Sori reaching nearly 

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

 ± 37a c.M. broad. 



Moluccas, New Guinea. 



(40ft) Pt . flni s tcppae) lto# . i Fod:, Rep., Y, 57. 



Rhizome and stipes unknown. Fronds elongate;Osaler-+f'^trc^M. long or 

 longer, to 30 c.M. broad, pinnatg_at-4lw15aser pinnatifid towards the apex. 

 Lowest pinnae^^^isJ-^-TrUrrapart, sometimes more approximate, short-stalked, 

 fu)4cnfatthe bas e on tho lower eide, th e 1 — 5 following pinnao docurront , 



(*) See also Ft. heterophlebla, Kze. 



