189 241 



represented by an authentical specimen (C), is a large form of D. Eggersii with 

 pinnæ 25 cm long. 



Ecuador: El Recreo, Eggers nr. 15319 (B); Llalla, Spmuce nr. üüßS iRB); Andes quitenses Sodiko (C). 



Colombia: Smidtchen (B); Schlim (B). 



Costa Rica: Navarro, Wercklé (C, W); Llaiuiras de San Carlos, C. Brade nr. 483 (R). 



239. Dryopteris biformata Rosenst., Fedde, Repert. 7: 300. 1909. — Fig 34 c. 



Type from Peru: Tarapoto, Spruce nr. 4037 (RB!). 



A rather doubtful species, marked by its contracted fertile pinnæ and seg- 

 ments; this may be an individual character, and the species can not be said to 

 be well understood from the original specimens alone. The very remote, stalked 



a h c 



Fig. 34. Segments of a. D. Eggersii (Hieron.) C. Chr. (orig. of A. nutans Christ, witli 

 a hair from the rachis). — b. D. equitans (Christ) C. Chr. (orig.). — c. D. biformata 

 Ros. (orig., with a fragment X 4). — d. D. lagiibriformis Ros. (orig.) — all X I'/-- 



pinnæ give the leaves a peculiar habit; the sterile pinnæ resemble those of I), 

 tristis, but thej' are much more hairy and the lower ones not with a cuneate, entire 

 base. The rachis is gemmiferous. The mature sori form a continuous line. Rachis 

 densely stellato-pulverulent without long hairs. 



240. Dryopteris equitans (Christ) C. Chr. comb. nov. — Fig 34 b. 



Syn. Nephrodium equitans Christ, Bull. I'herb. Boiss II. 6: 163. 1906. 



Type from Costa Rica: Navarro 1400 m, leg. Wercklé (C!). 



Although this species resembles D. tetragona in having a rather distinct ter- 

 minal pinna and the basal pair of veins being truly anastomosing, it no doubt is 

 a near ally of D. Eggersii and its proper place is in this section. It ditTers from 

 Ü. tetragona in its erect rhizome, distinct indusium and densely pulverulent rachis 

 and costæ beneath, from D. Eggersii in its anastomosing basal veins and apex of 

 frond, from 1). nephrodioides var. Biolleyi by the absence of stellate hairs on the 

 leaf-tissue and indusium. — The dark-green, membranous pinnæ, which are up to 

 15 cm long, l'/n — 2 cm broad, are scarcely incised to the middle, above very 

 slightly and shortly pubescent, the costæ and costulae beneath pulverulent by stel- 

 late hairs but without long hairs. The rachis is pulverulent by very small stellate 

 hairs, which on a short pedicel bear 3 — 4 very short and generally simple branches. 

 Lobes a little oblique, obtuse with open sinuses between. Veins 6 — 8-jugate, those 



