8. HYMENOPHYLL0M. § 2. LEPTOCIONIUM. 97 



aceous; colour brownish; rachis black-brown, elastic, hairy like the stipe, 

 narrowly margined, the wing oKve-brown, flat, entire, or toothed towards 

 the apex; costae and veins stout, black-brown, brown-hairy, provided on 

 both sides with binate, membranaceous, conspicuously serrate crests. 

 Sori 1 — 4 to a pinnula, axillary, placed on abbreviated anterior branchlets ; 

 indusium large, broadly tubular, 2-valved + '/^•'^^■y down, narrowly 

 marginate, crested, the valves rounded, entire or minutely denticulate; 

 receptacle thick-setiform, exserted. — ■ Resembles partly H. Zollingerianum 

 Kse partly H. fuscnm V. D. B. 



War. apicifloriint: Costal crests indistinct; lobes obscurely 

 denticulate, sometimes subentire; sori occupying the narrowed apical 

 part of the fronds only; indusium with the valves entire. 



Va»'. BiBiiEor: Stipes + 3 cm. long; fronds + 4 cm. long, + 3 

 cm. broad; costal crests indistinct or wanting; indusium conspicuously 

 crested. 



NeiD Guinea. 



(30/") See No 41. 



(30,fy) H. siibrotiintluiu, e. A. v. n., in Bull. Btz., 1915, XX, 19. 



Rhizome filiform, naked or sparingly ferrugineo-pilose, as are the 

 stipes and rachises. Stipes filiform, + ^'4 — 3 cm. long. Fronds oblong, 

 ± 3 — 4 cm. long, + 1 '/^ — 2'/, cm. broad, 3 — 4-pinnatifid, the rachis 

 narrowly winged in the upper half Pinnae + 8 — 10 on a side, sub- 

 horizontal, close or approximate, often deeply pinnatifid on the upper 

 side only, with the higher segments generally simple, the central and 

 lower once or twice forked ; higher pinnae long-decurrent and often 

 connected, lower hardly decurrent, free. Ultimate segments + '/^ mm. 

 broad, blunt, remotely serrate-dentate, each with a single central vein. 

 Texture herbaceous; surfaces naked. Sori in the axils of the higher 

 pinnae, exserted, 2-valved 'j^-^slJ down, the base acute, provided with 

 none to several short or elongated, irregularly placed, slightly elevated 

 longitudinal ridges, the valves semiorbicular or nearly square, + 1 mm. 

 broad, sharply toothed; receptacle hardly exserted. 



Sumatra. 



(31) II. blailfllllll. Mac. 



Sori subterminal on much abbreviated segments, on the anterior 

 Ferns and Fern Allies. 7 



