﻿8. HYMENOPHYLLUM. § 1. EUHTMENOPHYLLUM. 67 



S. Indusium obovaie, narrowed at the apex. 



(14) A. Blumeanum. 

 5.5. Indusium oblong, the apex bluntly rounded or 

 subtruncate. 



€. Pinnae + 4 — 5 on each side. Indusium 



exserted, deeply 2-valved. (15) H. Treubii. 



6.€. Pinnae + 6 — 8 on each side. Indusium 



immersed, cut ^j^-way down. (16) H. rarum. 



2.2.3. Fully developed fronds more than 15 c.M. long. 



•{•. Ultimate segments d—I^j^m.M. broad. Receptacle globoso- 

 capitate. (17) H. formosum. 



•J-.f. Ultimate segments i^l^ — 2 m.M. broad. Receptacle mallei- 

 form. (18) H. Junghuhnii. 

 a.a. Fronds hairy or ciliate, at least on the central veins. 



h'. Central ribs of the segments purveyed ivith 2 wing-like, crisped crests. 

 f. Ribs slightly crested. Fronds rather long. (19) H. Zollingerianum. 

 •J'.f. Ribs broadly crested. Fronds rather short. (20) H. fuscum. 



b'.b\ Central ribs not crested. 



c'. Fronds under 5 c.M. long, + i c.M. broad. (21) H. borneense. 



c'.c'. Fully developed fronds mostly 5 — 10 c.M. long, i — 5 c.M. broad. 



d'. Fronds under 2 c.M. broad. Indusium free, cleft nearly to 



the base. (22) H. pedicularifolium. 



d'.d'. Fronds more than 2 c.M. broad. Indusium rather slightly 



immersed, cleft + ^j^-way down. (23) H. obtusum. 



c'.c'.c'. Fully developed fronds more than 10 c.M. long, 10 — 15 c.M. 



broad. (24) H. pachydermicum. 



(1) H. discosum, Christ, Bull. Herb. Boiss., VI, 140. 



Stipes liliform. Fronds ± 2 '/j c.M. long, ± 1 '/i c.M. broad, broadly 

 ovate ; rachis not winged. Pinnae alternate, nearly flabellately cut down to 

 the rachis into oblong segments 4 m.M. long, which are deeply forked. Sur- 

 faces naked; colour fulvous. Sori terminal on the segments, numerous, large, 

 round; indusium with the valves entire; receptacle short, not exserted. 



Philippines. 



(2) n. OOldeiS, MueU. 4' JBh., Journ. of Bot., XXVIII, 105. 



Stipes short, filiform, naked. Fronds lanceolate, 2 — 3-pimiate, pendulous, 



