189 241 
represented by an authentical specimen (C), is a large form of D. Eggersii with 
pinnze 25 cm long. 
Ecuador: El Recreo, Eacers nr. 15319 (B); Llalla, Spruce nr. 5668 (RB); Andes quitenses Sopiro (C). 
Colombia: SwiprCHEN (B); ScuriM (B). 
Costa Rica: Navarro, WEnckLÉ (C, W); Llanuras de San Carlos, C. BRADE nr. 483 (HR). 
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 pinnz 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 



Vail 
Ms 
Fig. 34. Segments of a. D. Eggersii (Hieron.) C. Chr. (orig. of A. nutans Christ, with 
a hair from the rachis). — b. D. equitans (Christ) C. Chr. (orig.). — c. D. biformata 
N 
Ros. (orig. with a fragment »X 4) — d. D. lugubriformis Ros. (orig.) — all >» 1!/o. 
pinne give the leaves a peculiar habit; the sterile pinnz resemble those of D. 
tristis, but they 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. l'herb. Boiss II, 6: 163. 1906. 
Type from Costa Rica: Navarro 1400 m, leg. WERCKLE (CI). 
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 differs from 
D. tetragona in its erect rhizome, distinct indusium and densely pulverulent rachis 
and costz beneath, from D. Eggersii in its anastomosing basal veins and apex of 
frond, from JD. nephrodioides var. Biolleyi by the absence of stellate hairs on the 
leaf-tissue and indusium. — The dark-green, membranous pinne, which are up to 
15 cm long, 1'»s—2 cm broad, are scarcely incised to the middle, above very 
slightly and shortly pubescent, the coste 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 
