71 123 



11. South Brazil 108. D. tenerrima (Fée) Ros. 



10. Indusiiim densely setose 109. D. palustris (Melt.) O. Ktze. 

 9. Sori supraniedial. Rachis pubescent. 



10. Stipe and rachis strong. Basal segments en- 

 larged 63. D. opposita var. amphioxypteris (Sod.) C. Chr. 

 10. Stipe and rachis very slender. Basal segments 



equal 115. D. reciimbens Ros. 



8. Costæ beneath densely soft-hairy by long, patent, 

 pluricellular hairs and sparsely scaly 



123. D. nitens (Desv.) C. Chr. 

 6. Leaf-tissue, especially above, densely and finely puberulous 

 by adpressed hairs. 



7. West-Indian species. Indusium small, setose or absent. 

 8. Segments 3 — 5 mm broad, both surfaces densely 

 downy. Stipe and rachis slender, not scaly 



116. D. ruslica (Fée) C. Chr. 

 8. Segments 5 — 7 mm broad, underside subglabrous. 



Stipe strong, scaly 117. D. Germaniana (Fée) C. Chr. 



7. Continental species. 

 8. Indusium persistent. 



9. Indusium black, slightly ciliate. Segments entire; 



veins 7 — 10 118. D. melanochlaena C. Chr. 



9. Indusium pale, setose. Segments toothed upwards. 



Veins 10-11 119. ö. atrorubens (Mett.) C. Chr. 



8. Indusium absent. 



9. Sori near the margin. Lower pinnæ auriculiform 



120. D. demerarana (Bak.) C. Chr. 

 9. Sori about medial. Lowermost pinnæ glanduli- 



form 147. D. Rusbyi C. Chr. 



5. Rachis more or less scaly. Segments often 5 — 7 mm broad. 

 6. Pinnæ incised two-thirds of the way down to the costa 



only, glabrous 122. D. Moritziana Urban. 



6. Pinnæ incised to a narrow wing to the costa. 



7. Lamina (costæ above excepted) glabrous. Basal seg- 

 ments enlarged 113. D. illicita Christ. 



7. Lamina pubescent, at least on the coslæ and costulæ 

 beneath. Basal segments not enlarged. 

 8. Sori medial or inframedial. 



9. Lamina firmly herbaceous to chartaceous. Costæ 

 beneath strigose or hairy by patent, rather stiff, 

 unicellular hairs. 



10. Leaf-tissue glabrous. Sori exindusiate 147. D.ßrarfei' Christ. 

 10. Leaf-tissue finely pubescent. Costæ beneath 



patently hairy 121. D. dominicensis C. Chr. 



9. Lamina very thin; costæ beneath and margins 

 with numerous soft, patent, pluricellular hairs 



123. D. nitens (Desv.) C. Chr. 

 8. Sori supramedial. Leaf-tissue finely pubescent above. 

 9. Rachis very sparsely scaly. Pinnæ distant, the 

 lower 2 — 3 pairs reduced. Veins 7 — 9. 



120. D. demerarana (Bak.) C. Chr. 

 9. Rachis very scaly. Pinnæ closer, about 10 pairs 



reduced. Veins 10—15.. 150. D. corazonensis (Sod.) C. Chr. 



