﻿522 61. DIPTERIS. 



h. Ultimnle segments entire. 



c. Fronds small, 2 — 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 



.segments. (3) D. quinquefurcata. 



b.b. Ultimate segrtients toothed, fronds rather large. (4) D. conjugata. 



* (1) IB. I^obbiana, Moore (not Bedd.), Christ, Farnkr. d. Erde, 

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

 MS. in Herb. Bog.; Polypodiwn hifurcatum, Bk., Hk. Bk., Syn. Pil., 562; 

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

 XI; — var. Bidleyi, Christ, Ann. Btz., XX, 126. 



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

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

 vided in 2 halfs, which are 3 — 4 X flabellately dichotomous. Ultimate lobes 

 linear, acute, + K — 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. fi&iclleyi: Fronds 10 — 15 c.M. long; ultimate lobes 3 — 4 m.M. 

 broad. Sori punctiform. 



Malaya ; — ■ var. Ridleyi : Borneo. 



* (2) D. Mieuwenliuiisii, Christ, Ann. Btz„ XX, 124, tab. Ill, 

 fig. 3. 



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

 brown, adpressed. Stipes distant, 30 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 forked and the outer 

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

 272 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. 



