35 ,S7 



7. Scales toothed, without long ciliés. Veins 12 — 18-jugale. 

 8. Scales ol' rachis adpressed. Sori near the midvein; indu- 



siuni persistent 37. D. Anniesii Ros. 



8. Scales of rachis hroad, loose. Sori medial without di- 

 stinct indusium ; 38. D. fenestralis n. sp. 



6. Scales entire with a pocket-shaped base. 



7. Veins 8— lU-jugale. Upperside glabrous. West-Indian species. 



39. D. vellea (Willd.) O. Ktze. 

 7. Veins 10 — 12-jugate. Both surfaces hairy. Brazil. 



40. D. cirrhosa var. eriocaulis (Fée) 

 2. Segments normally distinctly serrated or lobed, at least those of the basal 

 pinnæ. Central American and Andine species. 

 3. Basal pinnæ not considerably enlarged. Indusium distinct. 

 4. Veins reaching the margin. 



5. Surfaces with scattered, short, thick hairs, not glanduloso-pubescent. 

 Larger species, generally dark-green 41. U. nigrouenia (Christ) C. Chr. 

 5. Both surfaces (costæ excepted) glabrous or glanduloso-pubescent. 

 Lamina thin, light-green. 



6. Surfaces not glanduloso-pubescent, scales of stipe and rachis 

 rather thin, from a broad base narrowed into a hair-like apex, 



those of rachis bullate 42. Ü. Tondiizii (Christ) C. Chr. 



6. Surfaces throughout glanduloso-pubescent. Scales of stipe and 



rachis very narrow, black-brown 43. £). striyilosa Dav. 



4. Veins not reaching the margin. Scales of costæ bullate. Surfaces 

 glabrous. Lamina firm, dark-green. 

 5. Pinnæ pinnatifid only; segments serrated. 



6. Veins 2 — 3-jugate. Stipe and rachis slender. 



44. D. Lindeni (Kuhn) O. Ktze. 



6. Veins 5-jugate. Stipe strong 45. D. Saluini (Bak.) O. Ktze. 



5. Pinnæ pinnate in the lower half; segments or ])innules ligulate. 

 entire or deeply lobed with 2 — 3 obtuse lobes. 



46. D. lanceolata (Bak.) C. Chr. 

 3. Basal pinnæ the largest, bipinnatifid; upper ones smaller, pinnatifid with 

 entire segments. 



4. Small. Veins not reaching the margin. Sori very large, persistent. 



46. D. lanceolata (Bak.) O. Ktze. var. 

 4. Larger. Veins reaching the margin. Exindusiate. 



47. D. Hemsleijana (Bak.) C. Chr. 

 1. Veins normally furcate. 



2. Hairs of the common type, short, rarely unicellular. Veins generally not 

 reaching the margin. 



3. Segments narrow, uniformly serrate. Scales l)ullate. Indusium large. 



12' 



