61. DIPTERIS. 523 



* (5) O. qninqnefurcata, ChtHst, Parnkr. d. Erde, 123, fig. 

 350; Polypodium quinquefurcalum, Bk., Journ. of Linn. Soc, Bot., XXIV, 260. 



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

 Stipes straight, firm, naked, very long. Fronds cuneate-flabellate, 4—5 X 

 dichotomous with 16 or more linear-lanceolate ultimate segments to 50 c.M. 

 long, 12 — 20 m.M. broad. Texture rigidly coriaceous; primary veins stout, 

 raised, forming 1 row of large, subquadrangular primary areolae on each side 

 of the costae of the segments; secondary areolae numerous, fine. Sori near 

 de costae, scattered irregularly, confined to the primary areolae, forming groups 

 of 4 — 12 to an areola. — Very near D. Lobhiana, Mom-e. 



Borneo, Lingga Islands. 



* (4) D. conjugata, neinw., Christ, Parnkr. d. Erde, 123, fig. 

 348; D. Horsfieldii, Bedd., Ferns Br.I., II, tab. CCCXXI; D. Dipteris, Christ, 

 MS. in Herb. Bog.; Polypodium Dipteris, Bl., Rac, Flor. Btz., I, 108; Bl., Flor. 

 Jav., II, tab. LXXXI; P. Horsfieldii, R.Br., Hk., Spec. Pil., V, 99; — var. 

 alpina, Christ, Bull. Herb. Boiss., V S6rie, VI, 991. 



Rhizome creeping, densely clothed with blackish, adpressed, subulate scales. 

 Stipes 1 — 100 c.M. apart, 70 — 200 c.M. long, firm, naked, glossy, erect. 

 Fronds 30 — 90 c.M. long, more broad than long, divided quite to the base 

 flll 2 halfs, the main lobes of each reaching ± '/^ of the way down, once 

 or twice forked again, with the edges broadly and obliquely toothed. 

 Texture firm, coriaceous; surfaces naked, glossy, the lower often glaucous; 

 primary ribs prominent, dichotomously forked; areolae copious. Sori minute, 

 abundant, scattered irregularly, especially plentiful near the main veins. 



Var. alpina: Fronds 3X smaller; lobes few, obtuse, obscurely 

 toothed. 



Trop. Asia ^ Polynesia; — var. alpina; Laguna {Phih 



