S22 61. DIFTERIS. 



h. Ultimale segments entire. 



e. Fronds small, S — 3 X furcate with 6 — 8 ultimate segments^ 



(2) D. Nieuwenhuisii. 



C.C. Fronds middle-sized, 4 — 5 X furcate with i6 or more ultimate 



>>egments. (3) D. quinquefurcata. 



h.h. Ultimate segments toothed, fronds rather large. (4) D. conjugata. 



« (1) D. liObbiana, Moove (not Bedd.), Christ, Farnkr. d. Erde, 

 123; Bedd., Ferns Br I., 11, tab. CCXXXIII; D. hifurcata, Christ (not Bk.), 

 MS. in Herb. Bog.; Polypodium hifurcatum, Bk., Hk. Bk., Syn. Fil., 362; 

 P. Lobbianum, Hk., Spec. Fil, V, 100 (not IV, 226) ; Journ. of Bot., V, tab. 

 XI; — var. Ridleyi, Cbrist, Ann. Btz., XX, 126. 



Rhizome creeping, scaly, the scales bristle-like, subulate, blackish, small. 

 Stipes to 30 c.M. long or longer. Fronds 15 — 50 c.M. long, + as broad, di- 

 vided j/ji 2 halfs, which are 3 — 4 X flabellately dichotomous. Ultimate lobes 

 linear, acute, + 5 — 8 m.M. broad, the edges entire. Texture coriaceous, 

 central ribs prominent: areolae fine, in 1 or more rows. Sori small, 1 — 3 

 to each main areola, placed in 1 + irregular row on each side near the 

 costae of the lobes. 



Var. Ridleyi: Fronds 10 — IB c.M. long; ultimate lobes 3 — 4 m.M. 

 broad. Sori punctiform. 



Malaya; — var. Ridleyi : Borneo. 



* (2) D. Mieuwenliuisii, C%r«-«f, Ann. Btz„ XX, 124, tab. Ill, 

 tig. 5. 



Rhizome creeping, blackish-brown, the scales firm, bristle-like, dark- 

 brown, adpressed. Stipes distant, 50 c.M. long or longer, firm, brown, naked. 

 Fronds + 14 c.M. long, ± 22 c.M. broad, flabellate, 2-partite. Each half 

 cuneate at the base, 2-fid, with the inner segment fork«i and the outer 

 simple or forked again. Ultimate lobes + triangular-oblong, acumiuate, ± 

 27j C.M. broad at the base, entire, 2-costate. Texture rigidly coriaceous; 

 surfaces naked; costae prominent; veins horizontal, connecting the costae as to 

 form quadrangular primary areolae with smaller, included secondary ones. Sori 

 dot-like, scattered irregularly. 



Borneo. 



