122 70 



10. Lamina eglandulose. 



11. Coslæ beneath without scales. 



12. Indusium very large, persistent; sori 



medial 106. D. pacbyrachis (Kze.) O. Ktze. 



12. Indusium small or none. 



13. Sori medial, exindusiate 146. D. Bradei Christ. 

 13. Sori supraniedial or submarginal. 

 14. Indusium present; pinnæ about 

 l'/3cm broad; veins above spar- • 

 sely setose 110. D. Hieronymusii C. Chr. 

 14. Indusium none; pinnæ 2 cm 

 broad; veins above glabrous 



111. D. roraimensis (Bak.) C. Chr. 

 11. Costæ beneath with scattered, brown scales. 

 12. Segments with open spaces between; 

 indusium very large, persistent, glan- 

 dular 106. ü.pachyrachis \ar. Sprucei (Bak.) C. Chr. 

 12. Segments close, acute; indusium smal- 

 ler, not glandular 113. D. illicita Christ. 



9. Rachis rather pubescent. Underside eglandulose. 

 10. Sori medial. Lamina papyraceous or subcoria- 

 ceous. 

 11. Segments 2 mm broad, falcate-ligulate 



112. D. utanagensis Hieron. 

 11. Segments 3 — 4 mm broad, patent. 

 12. Basal segments parallel to rachis 



106. D. pachyrachis (Kze.) O. Ktze. 

 12. Basal segments (of larger pinnæ) over- 

 lapping the rachis or with interne 

 auricles. 



13. Rachis short-hairy; costæ beneath 

 without scales; indusium persistent 



107. D. siipina (Sod.) C. Chr. 

 13. Rachis long-hairy; costæ beneath 

 somewhat scaly; indusium none 



170. D. multiformis n. sp. 

 10. Sori near the margin. Lamina firmly mem- 

 branous. 



11. Lamina gradually narrowed downwards 



with 2 — 3 pairs of auriculiform pinnæ. 



Veins 8 — 9-jugale 120. D. demerarana (Bak.) C. Chr. 



11. Lamina abruptly attenuate with several 



pairs of glanduliform pinnæ. Veins 10 — 14- 



jugate 148. D. Christensenii Christ. 



8. Pinnæ with the lower segments free; segments crenate 



114. D. atropurpurea Hieron. 

 7. Lamina thinly herbaceous. 



8. Costæ beneath glabrous or sparsely pubescent by uni- 

 cellular hairs, without scales. 



9. Sori medial. Rachis glabrous or nearly so; under 

 surface generally glandulose. 

 10. Indusium glabrous, glandulose. 



11. Jamaica . . . 106. D. pachyrachis var. Jenmani (Bak.) 



