118 66 



13. Pinnæ equal-sided. 



14. Lamina thinly herbaceous. Seg- 

 ments broad, very oblique. 

 15. A distinct tuberculiform aë- 

 rophore at the base of the 

 pinnæ beneath. Sori infra- 

 medial. Guadeloupe 



81. D. hydrophila (Fée) C. Chr. 

 15. No distinct aërophore. Sori 

 supramedial. Argentina 



82. D. Lorentzii (Hieron.) C. Chr. 

 14. Lamina firmly herbaceous-mem- 

 branaceous. Segments not very 

 oblique. 



15. Veins 4-6-jugate ; rachis and 

 surfaces almost quite gla- 

 brous. 



16. A single pair ofauriculi- 

 form pinnæ 



74. D. tablana (Christ) C. Chr. 

 16. 3 — 4 pairs of auriculi- 

 form , often tripartite 

 pinnæ ... 79. D. Lindigii C. Chr. 

 15. Veins 8 — 10-jugate. 



16. Lamina downwards ab- 

 ruptly narrowed, char- 

 taceous, sparsely hairy 

 beneath on costæ and 

 costulæ only 

 80. D. histrata (Hieron.) C. Chr. 

 16. Lamina downwards gra- 

 dually narrowed, firmly 

 herbaceous or mem- 

 branous. 



17. Indusium persistent, 

 very setose. Rachis 

 glabrous 

 109. D. palustris (Mett.) O. Ktze. 

 17. Indusium small, de- 

 ciduous.Rachis spar- 

 sely hairy. 

 18. Veins indistinct. 

 Lamina firmly 

 membranous, 

 the underside 

 nearly glabrous 

 throughout, the 

 upperside spar- 

 sely pubescent 



110. D. Hieronymusii C. Chr. 



