﻿76 8. HYMENOPHYLLUM. § 2. LEPTOCIONIUM. 



g'.g'. Indusium divided ^j^-way down, the lips nar- 

 rowed at te apex. (35) H. serrulatum. 

 b.b. Edges crisped. 



±. Indusium quite naked on the back. 



2. Fronds under 8 c.M long; valves of the indusium elliptical. 



(56) H. fraternum. 

 2.2. Fronds more than 8 c.M. long; valves of the indusium + 

 orbicular. 

 3. Edges bluntly dentate, the teeth not deep. 



(57) H. Reinwardtii. 

 3.3. Edges aculeate-dentate, the teeth deep. 



(58) H. physocarpum. 

 1.1. Indusium spinulose on the back. 



:^. Edges of the segments deeply toothed nearly to the midribs. 



(59) H. sabinifolium. 

 :^.^. Edges not deeply toothed. (40) H. Neesii. 



1.1.1. Indusium surrounded by irregularly spinas o-dentate, transversal crests 

 at the base. 

 2'. Valves of the indusium serrate or dentate. 



3'. Fronds 5 — 8 c.M. long. Indusium divided + ^f^-ivay 



down. (41) H. denticulatum. 



3.3'. Fronds 2^j^ — 5 c.M. long. Indusium divided + ^l^-way 



down. (42) H. aculeatum. 



2'.2'. Valves of the indusium entire. (45) H. bismarckianum. 



1.1.1.1. Indusium surrounded by a row of rather close, longitudinal 



crests at the base. (44) H. brachyglossum. 



(25) H. subflaliellatiini, Ces., Fel. di Bor., 8. 



Rhizome creeping, branched, hairy. Stipes slender, 5 — 10 m.M. long, 

 not winged. Fronds 5 — lo m.M. long, 5-partite, nearly flabellate. Primary 

 segments ± pinnatifid. Lobes linear, obtuse, distant, spinuloso-denticulate. 

 Sori terminal on the lobes; indusium ovate, with the edges of the valves 

 spinuloso-ciliate ; receptacle exserted. 



Borneo. 



(26) H. edulentum, C. Chr., Ind. Fil.; Leptocionium edulentum, 

 V. D. B., Ned. Kruidk. Arch., V^ 148. i 



