﻿45a. PTERis. 353 



5 branches clustered at the apex of the stipe, the lateral 

 branches often nearly as long and similarly 2-pinnatilid as 

 the central one, not rarely forked near the base with more 

 or less divided secondary branches. § 1, c**. Partitae. 

 aM. Veins free except that the central ribs (costulae) of the ultimate seg- 

 ments are more or less connected at the very base by arching veins 

 forming 1 single row of costal areolae on each side. § 2. CAMPTERIA. 

 a.a.a. Veins anastomosing more copiously than in a.a. § 3. LITOBROCHIA* 



§ 1. EUPTERIS. a. Pinnatifidae. 



* (1) Pt. reducta, BU., Journ. of Bot., XVIII, 211; Pt. biaurita.L., 

 var., C. Chr., Ind. Pil. 



Stipes tufted, 15 — 25 c.M. long, erect, naked, the base often dark-coloured 

 and slightly scaly. Fronds 25 — 35 c.M. long, 5 — 7 c.M. broad, linear-lanceo- 

 late, cut down in the upper part nearly, in the lower nearly or quite to the 

 costa into 50 — 40 pairs of crowded, • linear lobes below the caudate apex. Lobes 

 ± close or slightly imbricate, rather spreading, subfalcate, 6 — 9 m.M. broad, 

 the apex bluntly rounded, entire or slightly crenate, the edges parallel, entire, 

 the lower lobes hardly shorter than the others. Texture firm; costules and 

 veins prominent, the latter simple or forked : surfaces naked. Sori not reaching 

 the apex of the lobes, often (but not always) extending to the top of the 

 sinuses; indusium narrow. 



Sumatra. 



a. 



a.Ut 



% 1. EUPTERIS. b. Piniiatae. 



Fronds dimorphous. Lowest barren pinnae simple, lowest fertile ones often 

 contracted, mostly forked or pinnatifid on the upper side only. (2) Pt. rangiferina 

 Fronds uniform. Lowest pinnae simple or 2 — 3- furcate, the fertile ones 

 sometimes contracted, not divided as in a. 

 h. Pinnae cordate, truncate or rounded at the base. 

 ■f. Veins close; lower pinnae + sessile. 



%. Lowest pinnae + largest. Rachis reddish or purpureous, 

 deciduously villose. (3) Pt. orientalis. 



FiLiCES. 23 



