﻿72 8. HYMENOPHYLLUM. § 1. EUHYMENOPHYLLUM. 



boidal, cut down to a winged rachis into simple or once or more times divided 

 segments on each side. Ultimate lobes ± 2—4 m.M. long, ^2 — 1 m.M. hroad, 

 entire, each with a single central rib. Surfaces naked. Sori on the higher 

 pinnae, terminal on narrowed segments; indusium obovate, the base rounded, 

 the valves entire, narrowed towards the apex; receptacle linear, not exserted. 

 Trop. Asia. 



* (15) H. Treuliii, Rac, Flor. Btz., I, 15; Nat. Tljdschr. Ned. Ind., 

 LIX, tab. III. 



Rhizome slender, wide-creeping, sparingly hairy. Stipes filiform, distant, 

 2 — 3 c.M. long, sligthly winged towards the frond. Fronds ± ovate in general 

 outline, 5 — 8 c.M. long, 3 — 5 c.M. broad; main rachis flexuose, narrowly 

 winged. Pinnae erecto-patent, to 4 — 5 on each side, cut down to a winged 

 rachis into + 5 — 5 simple, forked or pinnatifid pinnulae. Ultimate segments 

 oblong or linear, 2 — 15 m.M. long, + 2 m.M. broad, the apex often emarginate. 

 Surfaces naked; a single central rib in each segment. Sori terminal on short 

 segments; indusium deeply 2-valved; valves suboblong, the apex rounded or 

 subtruncate, entire, or slightly and irregularly erose; receptacle erect-oblong. 



Java. 



(16) H. rarum, JK. Bf., Hk. Bk., Syn. Fil., 58; Kze, Farnkr., I, 

 tab. XCVI, fig. 1; //. semibivalve, Hk. ^ Grew, Ic. Fil., tab. LXXXIII. 



Stipes very slender, ^'/i — 8 c.M. long. Fronds flaccid, pendent, 5 — 15 

 c.M. long, 2 '/a — 5 c.M. broad, linear-oblong, 2-pinnatifid, the main rachis winged 

 throughout. Pinnae simple, linear, or forked to pinnatifid with 2 — 3 deeply 

 cut segments on each side, which are V2 — IV2 <^M- long, ± S'/j m.M. broad. 

 Sori large, terminal on the segments of the upper pinnae, often Vj^ m.M. 

 broad; indusium divided V2"Way down or more, the base cuneate, the valves 

 rounded; receptacle erect-oblong. 



? Malacca: Tasmania, New Zealand. 



* (17) H. formoiiiiiii, nravh., V. D. B., Hymen. Jav., 59, tab. 

 XLVII— XLVIII ; H. dilatatum. Sw., Rac, Flor. Btz., I, 17, p. p.; C. Chr., 

 Ind. Fil. 



Rhizome creeping, hairy. Stipes 5 — 10 c.M. long, mostly narrowly winged. 

 Fronds 15—30 c.M. long, or to 40 c.M. long, + 5 — 10 c.M. broad; main 

 rachis winged throughout. Pinnae erecto-patent, cut down to a winged rachis, 

 short-stalked. Pinnulae erecto-patent, deeply pinnatifid again into linear, simple. 



