S. HTMENOPHYLLUM. g 1. EUHTMENOPHYLLUM. 



67 





5. Indusium "^ovate, narrowed at the apex. 



(14) A. Blumeanum. 

 5.5, Indusium oblong, the apex bluntly rounded or 

 subtruncate. 



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

 exserted, deeply 2-valved. (1 5) H. Treubii. 

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

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

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

 Ultimate segments i—l%m.M. broad. Receptacle globoso- 

 ! capitate or clavate. (j?) h. formosum. 



f.f. Ultimate segments i\— 2 m.M. broad. Receptacle mallei- 

 form or broadly flabeUate-cuneate.{18) H. Junghuhnii. 

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



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

 •J-. Ribs slightly crested. Fronds rather long. (19) H. ZoUingerianum. 

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



b'.V. Central ribs not crested. ■ , - ^^ 



c'. Fronds under 5 c.M. long, 4^ i e.M. . bmad . (21), H. borneense. 



c'.c'. Fully developed fronds mostly 5- — tO c.M. long, 4 — 5 c.M. broad: 



A'. Fronds under 3 c.M. broad, — Ind usium free, cleft nearly to 



the base. «^-< 



«y>» 



,a-a^«--J 



(22) H. pedicularifolium. 



d'.d'. 



, , immersed. 



<^<^-»^. (23) H. obtusum. 

 ■4-'.f'.c'.. Fully — developed fronds mure tliaii 10 c.M. long, 10 — 15 c.M . 

 broadi /ta)*-co£'..*~, t--»»i«.£.^jO,^c«;r^.(24) H. pachydermicum. 



(1) H. di s co S HiM, Chi - itt, Bull. Horb. BoiBs., A^, 140. ^^_^ 



Stipes filiform. Fronds ± ^% c.M. long, + 1 Vj c^M^.iiwsC^^ly 

 ovate; rachis not winged. Pinnae alternate, neady^tSEenately cut down to 

 the rachis into oblong segments 4^JU-4t5ngrwhich are deeply forked. Sur- 

 faces naked ; colour ful;£OHsr-'''Sori terminal on the segments, numerous, large, 

 round ; iMuswilfwth the valves entire ; receptacle short, not exserted. 



(2) H. ooides, Muell. 4r JBk., Journ. of Bot., XXYIII, 105. 



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



