12() 74 



9. Sori close to the margin. West-Indian species 



149. IJ. limhata (Kze.) O. Ktze. 

 9. Sori about medial. Ecuador ... 170. 1). multiformis n. sp. 

 <S. Basal segments without interne auricle. 



9. Lamina rather gradually reduced downwards 



140. i). Sprenyelii var. Sherringii (Jenni.). 

 9. Lamina abruptly reduced, tiie lowermost pinnæ 

 glanduliform. 

 10. Both surfaces finely pubescent. Segments 2—4 



mm broad 143. 1). conformis (Sod.) C. Chr. 



10. Lamina quite glabrous. Segments 5 — 7 mm 



broad IGL J), eiichlora (Sod.) C. Chr. 



ß. Rachis rather scaly. Lamina suddenly with 5 — 8 pairs 



of auriculiform pinnæ 150. Ü. corazonensis (Sod.) C. Chr. 



5. Lamina coriaceous or chartaceous with the margins more 

 or less revolute, downwards abruptly narrowed with 2—5 

 pairs of distant, glanduliform pinnæ. Costæ beneath often 

 with some few scales. 



(>. Tiie revolute margins not covering the sori. Basal seg- 

 ments of larger pinnæ generally much reduced. 

 7. (>ostæ beneath glabrous or more or less pilose by 

 short, unicellular hairs. 



8. Lamina quite glabrous 151. D. semilunata (Sod.) C. Chr. 



8. Lamina (at least rachis) more or less pilose. 



9. Pinnæ about 5 cm long with very oblique seg- 

 ments 152. D. canelensis Ros. 



9. Pinnæ 10 — 20 cm long, the segments often falcate 

 but not very oblique. 



10. Costæ beneath setose by more or less antrorse 

 stilf hairs and generally furnished with scat- 

 tered small, brown scales. Indusium none. 

 11. Sori medial. Largest pinnæ scarcely 12 cm 

 long. Lamina (costa excepted) subglabrous 



153. D. nervosa (Kl.) C. Chr. 

 11. Sori supramedial. Largest pinnæ 15 — 20 

 cm long. Lamina, especially beneath, setose. 

 12. Segments rather close with acute sin- 

 uses between 154. D. rudis (Kze.) C. Chr. 



12. Segments patent separated by broad 



open sinuses 155. D. Engelii Hieron. 



10. Costæ beneath pilose by patent hairs. 



11. Largest pinnæ 10 — 18 cm long, horizontal 

 or ascendent, sparsely slrigose beneath 

 on costæ and costulæ on\y. Receptacle 

 glabrous. Segments close, oblique or sub- 

 falcate. 

 12. Basal segments without auricle. 



13. Veins 11 — 12-jugate. Segments ob- 

 tuse 158. Ü. strigifera Hieron. 



13. Veins 14— 15 -jugate. Segments 



acute 159. D. Brausei Hieron. 



12. Basal segments with an interne auricle 



170. Ü. mulliformis n. sp. 



