95 147 



the base of the stipe. Pinnæ opposite, coriaceous, like rachis quite glabrous, 10 — 

 12 cm long, 2 cm broad, arcuate-ascending, the lower ones at base with a pair of 

 glanduliform free pinnulæ and above them a pair of auriculiform segments, basal 

 segments of medial pinnæ reduced. Segments 5—6 mm broad, acute, falcate, their 

 margins revolute. Veins not very distinct, 10 — 12-jugate, simple. The specimen 

 seen is sterile; according to Sodiro the sori are near the margin and furnished 

 with a deciduous indusium. 



Differs from the allied species (D. rudis, Ü. piloso-hispida etc.) by its entirely 

 glabrous leaf and the pale underside. 



152. Dryopteris canelensis Rosenstock, Fedde, Repert. 7: 302, 1909. 



Type from Ecuador, in sil va Canelos, Spruce (RB!). 



A species allied to D. rudis but well marked by its short and narrow pinnæ, 

 coriaceous texture, very oblique segments with about 11 pairs of veins and its very 

 tomentose rachis. 



153. D. nervosa (Kl.) C. Chr., Revision nr. 75. 



Area: British Guiana, Costa Rica; Panama, Maxon nr. 4966 (W). 

 Rizome creeping. Much like a glabrescent form of D. rudis and perhaps it 

 should be united with that species. 



154. D. rudis (Kze.) C. Chr., Revision nr. 73 fig. 48. Smiths. Misc. Coll. 52: 391. 



Area: Mexico along Andes to Ecuador and Bolivia. Jamaica {P. ctenoides 

 Jenm.). 



A widely spread and rather uniform species, of which I have recently recei- 

 ved several specimens, f. inst. from Panama, Maxon nr. 5675 (W) and Bolivia, 

 BucHTiEN nr. 494 (R). It varies mainly in texture and pubescence; generally the 

 whole lamina is rather densely setose by stiff hairs and the costæ beneath are 

 furnished with some brown scales, still the upper surface can be nearly quite 

 glabrous and such specimens are scarcely to distinguish from D. nervosa by any other 

 character than the supramedial sori. This more glabrous and generally smaller 

 form is D. lasiopteris (Sod.) C. Chr. Revision nr. 69 fig. 45, which I now do not 

 hesitate to reduce to a synonym of D. rudis. About the same form, still with fewer 

 (9) veins is 



Dryopteris caeca Rosenstock, Fedde, Repert. 7 : 302. 1909, from Ecuador, 

 Spruce nr. 5261 (RB). 



Aspidium subdecussatum Christ, Bull. L'Herb. Boiss. II. 4: 960. 1904. 



Dryopteris subdecussata C. Chr. Index 295. 1905. 



Costa Rica, Alfaro nr. 16556 (C) is rather typical D. rudis. 



Aspidium exsadans var. myriocarpum Fourn. Mex. Plant. 1 ; 94 is also, accor- 

 ding to specimens in Herb. Mus. Paris so named by Fournier, a synonym of the 

 present species. 



