8. HYMENOPHYLLUM. § 1. EUHYMEINOPHYLLUM. 7S 



lateral segments; indusium as broad as the segments, divided + '/r^aydown; 

 valves rounded, strongly ciliated, the base + cuneate, immersed. 

 Borneo, Philippines, New Guinea; Hawaii. 



(24) H. pachyderniicnin, Ce*., Pel. di Bor., 8. 



Rhizome slender, intricate, covered with brown bristles. Stipes slender, 

 + setulose, 1 — 3 c.M. long. Barren fronds short, subflabellate, as broad as 

 long; fertile ones oblong or lanceolate, ± 20 c.M. long, lO — 15 c.M. broad. 

 Primary segments Obtuse or truncate, obovato-linear. Lobes 3 — 3 to a seg- 

 ment, densely barbate at the apex in the barren bronds. Under surface covered 

 with short, brown hairs, especially on the veins. Sori immersed; valves of 

 the indusium ovate, acute; receptacle filiform, exserted. 



Borneo. 



% % LEPTOCIONIUM. 



a. Fronds 3-partite, subflabellate. (25) H. subflabellatum. 



a.a. Fronds pinnately divided. 

 h. Edges not crisped. 



c. Main rachis narrowly marginale. (26) H. edulentum. 



C.C. Main rachis distinctly winged' throughout or nearly so. \ 



d. Sori terminal on the main or higher secondary rachises, 



e. Valves of the indusium hardly toothed. (27) H. Kurrii. 

 e.e. Valves of the indusium subulate-dentate. (28) H. Lobbii. 

 a.d. Sori axillary on the anterior side of the pinnae or pinnulae. 

 if.. Indusium without crest-like ridges at the base, roundish. 



(29) H. tunbridgense. 



C.C.C. Main rachis not winged, or winged in the upper half only. 



d'. Valves of the indusium toothed. (31) H. blandum. 



d'.d'. Valves of the indusium entire. 



e. Fronds under 5 c.M. long. (32) H. praetervisum. 



e'.e'. Fully developed fronds 5 — 20 c.M. long. 



f. Veins paleaceo-hirsule. (33) H. violaceum. 



f.f. Veins naked. 



g'. Indusium short-2-lipped, the lips rounded. 



(34) H. multifidum. 



