8. HYMENOPHYLLUM. § 1. EUHYMENOPHYLLUM. 89 



(11a) H. pilosum, e. A. v. n., in Bull. Btz., 1914, XVI, 57; — 

 var. nirmalanum, v. A. v. R., 1915, XX, 19. 



Rhizome wide-creeping, filiform, sparingly long-hairj^, giabrescent, the 

 hairs ferrugineous. Stipes scattered, 1 — 2 cm. long, copiously hairy on 

 the dorsal side, as are the rachis, costae, costulae and central veins of 

 the ultimate lancinulae, winged, the hairs partly crowded, partly scattered, 

 erect or spreading, long, ferrugineous, curved or flexuose, the wing 

 narrowly linear-cuneate. Fronds lanceolate-oblong, ± 3 — 8 cm. long, + 

 2 — 2'J2 cm. broad, 2-pinnatifid, the rachis winged. Pinnae ascending, 

 close, ± 8 — 10 on a side, the central the largest, to I'/j cm. long, 

 pinnatifid into 2 — 5 ascending, close, simple or rarely 2-fid segments on 

 a side; wings and lacinulae flat, the latter oblong or linear, 1 — 4 mm. 

 long by ± 1 mm. broad, rounded at the apex. Texture membranaceous ; 

 surfaces naked; colour brown when dry; ultimate veins not reaching the 

 apex of the lacinulae. Sori solitary and axillary on the higher pinnae; 

 indusium oblong, 2-valved about ^l^-^^ay down, hairy on the lower side at 

 the base; valves rounded or subacute, entire or somewhat crenulate; 

 receptacle somewhat exserted. 



Forma typica. — Sumatra. 



War. niriBialanuiti: Fronds relatively shorter and broader, + 

 2% — S'/i cm. long, + l','^ — 2'/2 cm. broad, oblong or ovate; pinnae less 

 numerous. — Java. 



(12a) See No. 13. " 



(13) H. aialakeiise, Rac. 



Edges of wings and segments not rarely distinctly crisped; indusia 

 entire to repando-crenulate. 

 Also in Borneo. 



(13a) H. Hallierii, Mtst., in Bull. Btz., 1911, II, 23. 



Rhizome rather firm, woody, creeping, giabrescent. Stipes distant, 

 to 5 cm. long, distinctly winged nearly quite to the base. Fronds lanceolate- 

 oblong, + 12 cm. long, 8 cm. broad, long-acuminate. Largest pinnae 

 ovate-lanceolate, suberect, to 3 cm. long, 1% cm. broad, incurved at the 

 apex. Lower pinnulae spreading or somewhat decurved, flabellately 

 2-pinnatifid. Ultimate segments linear, rounded and emarginate at the 

 apex. Surfaces naked ; colour dark-ohvaceous ; rachises subflexuose, broadly 



