63 115 



Key. 



1. Tertiary veins 1 — 10-jugate. Lamina towards the base gradually, rarely 

 abruptly attenuate, or, in some few species, not at all narrowed down- 

 wards. 



2. Rhizome erect or decumbent with the stipites fasciculated. Veins 

 nearly always simple. 

 3. Pinnæ rarely more than I'/a cm broad, 10 cm long. 



4. Lamina towards the base very gradually narrowed ; reduced 

 pinnæ numerous, stipe very short (type 11). Basal segments, 

 especially the upper one, generally longer and often broader 

 than the others. Most species small. 

 5. Pinnæ entire or subentire, ^'3— I'/a cm long. 



6. Pinnæ short-stalked, about 1 cm long; rachis without 



scales 54. D. pusilla (Mett.) O. Ktze. 



6. Pinnæ sessile, I'/a cm long; rachis scaly 



55. D. brachypoda (Bak.) C. Chr. 

 5. Pinnæ deeply lobed, or, as a rule, pinnatifid. 

 6. Rachis scaly. 



7. Pinnæ scarcely 2 cm long, auricled on both sides of 

 the base, subentire or subpinnatifid; stipe nearly none 



55. D. brachypoda (Bak.) C. Chr. 

 7. Pinnæ 3— 4 cm long, regularly pinnatifid; stipe 3 — 4 cm 



long 102. D. Funckii (Mett.) O. Ktze. 



6. Rachis without scales. 



7. Veins not prominent above; lamina herbaceous or 

 thinly membranous. 



8. Pinnæ unequal-sided, the anterior (upper) side 

 being broader than the posterior one. 

 9. Rhizome small, erect. Pinnæ pinnatifid, generally 

 glandulose beneath. 



10. Indusium absent or minute. 56. D. sancta (L.) O. Ktze. 

 10. Indusium large, persistent. 



11. Lamina herbaceous; sori about medial; 



reduced pinnæ few 57. D. sanctiformis n. sp. 



11. Lamina membranous to coriaceous; sori 



close to the margin 59. D. consanguinea (Fée) C. Chr. 

 9. Stem epigæous, very long and scaly; pinnæ with 

 a straight, cuneate, entire base on the lower side, 

 not deeply cut, eglandulose 58. D. longicaulis (Bak.) C. Chr. 

 8. Pinnæ equal-sided, but sometimes auricled at the 

 upper base only. 



9. Leaf thinly herbaceous. Small species with pinnæ 

 2— 3 cm long; veins 2— 3-jugate. 

 10. Segments entire, the margins not revolute. 

 11. Sori supramedial; lamina scarcely 30 cm 



long 60. D. delicatula (Fée) C. Chr. 



11. Sori medial; lamina up to 50 cm long 



61. D. pseudosancta C. Chr. 

 10. Segments crenate with revolute margins 



62. D. physematioides (Kuhn et Christ) C. Chr. 

 9. Leaf firmly herbaceous or membranous. Most 

 species larger with pinnæ 3 — 10 cm. long. 



