73 125 



6. Margins of segments revolute covering the sori. Lamina 

 coriaceous, glandular beneath. Veins simple. Lower basal 



segments prolongated 169. D. cheilanthoides (Kze.) C. Chr. 



6. Margins plane. Lamina membranous, eglandulose. Veins 

 often furcate. Lower basal segments not prolongated 



162. D. Glaziovii (Christ.) C. Chr. 

 4. West Indian and Andine species. 



5. Lamina herbaceous or membranous; margins plane or 

 slightly revolule. 

 6. Rachis not or very slightly scaly. 



7. Segments entire or inconspicuously toothed, the basal 

 ones without auricles. 

 8. Rachis glabrous or with few, deciduous hairs. 



9. Lamina glandulose beneath 140. I). Sprengelii (Klf ) O. Ktze. 

 9. Lamina eglandulose. 



10. Segments 2—4 mm broad. Leaf-tissue of both 

 sides minutely puberulous. Sori close to the 

 edge. Veins 10 — 15-jugate. 

 11. 3 — 4 pairs of lower pinnæ auriculiform. 

 Segments very close entire 



141. I), struthiopleroides C. Chr. 

 11. 3—4 pairs of lower pinnæ glanduliforni. 

 Segments not close, often serrate. 



143. D. conformis (Sod.) C. Chr. 

 10. Segments 5 — 7 mm broad. Leaf entirely gla- 

 brous; costæ beneath with some scattered light- 

 brown scales 161. Ü. euchlora (Sod.) C. Chr. 



8. Rachis and costæ more or less pilose. 



9. Sori indusiate. Lamina glandulose beneath 



142. Ü. Mercurii (A. Br.) Hieron. 

 9. Sori exindusiate, or indusium very small. Lamina 

 eglandulose. 



10. Lower pinnæ very gradually reduced. 

 11. Sori oblong or linear 



see nr. 125. 1). consimilis and nr. 126. I), heteroclita. 



11. Sori round 144. I), scalaris ((Christ.) C. Chr. 



10. Lower pinnæ abruptly reduced, the lowermost 

 glanduliforni. 

 11. Leaf-tissue of upperside glabrous. 



12. Sori medial. Rachis with some few 



scales 146. 1). Bradei Christ. 



12. Sori supramedial. Rachis densely ochra- 

 ceo-tomentose without scales 



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

 11. Leaf-tissue of upperside finely pubescent. 

 12. Sori medial. Costæ on both sides se- 

 tose. Bolivia 147. D. Rusbyi C. Chr. 



12. Sori near the margin. Rachis and costæ 

 beneath very shortly and densely pul- 

 verulent 148. I). Christensenii Christ. 



7. Segments crenate or more or less lobed. 



8. Basal segments with an interne auricle which over- 

 laps the rachis. 



1). K. I). VUlensk. Selsk. Skr.,7- Kiekke, ualurvidensk. og iiKithem. Aid. X 2. l' 



