450 FiLicES. [Notholoena. 



less densely covered underneath with rust-coloured hairs, more loosely scat- 

 tered on the upper side. Larger pinnae about 1 in. long ; segments 1 to 3 

 lines, lobed or pinnatifid, ovate-oblong or obovate. Sori marginal when 

 young, with the edge of the segment slightly turned down over them ; when 

 old often occupying the greater portion of the under surface. — N. pilosa. 

 Hook, and Am. Bot. Beech. 74 and 355. 



Hongkong, Dili, Wright, Wilford. Also on the adjacent continent and in tlie Pacific 

 islands. 



15. ASPLBNIUM, Linn. 

 (Diplasiilm, iSto.) 



Sori linear or oblong, scattered on the under surface of the frond-segments, 

 more or less oblique (with reference to the midrib), along one or both sides of 

 a vein, with a longitudinal indusium, straight or slightly curved, proceeding 

 from the vein and opening along the opposite edge. — Ehizome short, with 

 tufted fronds, or creeping. Fronds very various. 



A large genus, distributed over nearly the whole globe. 



Fronds simple. 



Fronds 3 ft. long or more, sessile or nearly so \. A. nidus. 



Fronds less than 1 ft., on along stipes.. . . ..... %. A . lancewm. 



Fronds divided. 



Pronds simply pinnate. Segments lanceolate, cuneate or acute 

 at the base (rareh/ ohtuse). Veins forked. 

 Segments rigid, lanceolate-falcate, serrate. Sori much raised, 



very oblique, aU single 6. ^. macroph^Uum. 



Segments few, oblong-lanceolate, entire or scarcely crenate. 



Sori rather obHque, often double 6. A.Jraxinifolitim. 



Fronds twice or thrice pinnate. Segments small, cuneate. Veins 

 forked. 

 Segments or lobes 3 to 6 lines long, with 2 or more sori in each 4. A. cuneatum. 

 Segments or lobes 1 to IJ lines long, with a single sorus on each 3. A. davalUoides. 

 Fronds once to thrice pinnate, with long crenate or pinnatifid 

 segments, tnmcate or cordate at the base. Veins pinnate. 

 Vein-branches of each set free from those of the adjoining set. 

 Fronds once, rarely twice pinnate, with crenate or scarcely 



lobed pinnae. . T. A. sylvatieum. 



Fronds once pmnate, with deeply pinnatifid pinnte . . . 8. ^. Schkuhrii. 



Fronds twice or thrice pinnate 9. ^ dilatatum. 



Outer vein-branches of each set anastomosing with those of the 

 atyoining set. Fronds mostly thrice pinnate ..... 10. A. esculentum. 



(The insertion of A.fontanum, Bemh., in the Enumeration of Hongkong Ferns in Seem. 

 JJot. Her. 428, appears to have originated in a mistake.) 



1. A. nidus, Unn. ; Hook. Spec. Ml. iii. 77 ; Boi. Mag. t. 3101. Fronds 

 smaple, entire, lanceolate, sessile or nearly so, in large regular tufts, hoUowed 

 in the centre, the larger ones 2 to 6 ft. long, and 3 to 5 in. broad. Veins 

 numerous, nearly transverse, paraUel, simple or forked. Sori along the upper 

 or inner side of nearly all the veins, mostly reaching from the midrib to i or 

 nearly -j of their length.— iVeoWqpiJms nidm, J. Sm. in Seem. Bot. Her. 427. 



In the Happy Valley, Vrquhart ; behind the Buddhist Temple, Wilford; dsoffance M 

 ChZT " " °^ ' '""""^ *° ^"'*""''' ""'^ "orthwilrd to Benin and 



