204 152 



9. Lower 1 — 3 pairs of pinnæ more or less 

 reduced. Basal veins often united. Lobes 

 patent with open sinuses between. Pinnæ 

 numerous. Jamaica. 



1(1. Indusium small. Sori medial or infra- 

 medial. Veins (5 — 8-jugate. Pinnæ rarely 

 incised to the middle. 233. 1). usitata ( Jenm.) C. Chr. 

 10. Indusium large, glabrous. Sori supra- 

 medial. Veins 10 — 12-jugate. Pinnæ in- 

 cised above the middle. 



234. D. oenusta (Hew.) (). Ktze. 

 7. Most pinnæ short-stalked. 



8. Veins all simple, the lowei' ones conniveni lo 

 sinus, rarely united. Leaf-tissue glabrous. 



228. D. pyramidata (Fée) Maxon. 

 8. Basal veins united and the up[)er ones often 

 furcate. Both surfaces pubescent. 



220. D. bermudiana (Bak.) Gilb, 

 (i. Rhizome creeping. Brazilian species. 



7. Pinnæ scarcely incised to the middle, their base 

 truncate, hairy beneath; veins (i — 7-jugate. 



244. D. Schwackeana Christ n. sp. 

 7. Pinnæ incised above the middle, lower ones nar- 

 rowed towards the base. 



8. Hachis and costæ beneath without scales. 

 Lower pinnæ sessile, lobed to the base.. 



236. 1). scabra (Pr.) C. Chr. 

 8. Rachis and costæ beneath with small scales. 

 Lower pinnæ short-stalked with a short, entire, 



cuneate base 237. D. monosora (Pr.) C. Chr. 



5. Rachis and underside with erect, anchor-shaped hairs. 



Basal veins united 247. Ü. ancyriotlirix Ros. 



4. Rachis and costæ beneath densely pulverulent by short, stel- 

 late hairs, which are often intermixed with longer, simple 

 hairs, or, the latter predominating, densel}' tomentose. 

 5. Indusium hairy by simple hairs or glabrous. Leaf-tissue 

 of both sides glabrous or hairy by simple hairs. 

 (). Indusium setose. 



7. Andine species. Rhizome erect (always?). Rachis 

 and costæ beneath without scales. 

 8. Rachis (and costæ beneath) without thick, long 

 hairs, but densely stellatopulverulent. 

 9. Veins 10— 16-jugate, the basal ones conniveni 

 lo sinus. Upperside (costæ excepted) glabrous. 

 10. Fertile pinnæ and segments not contrac- 

 ted; rachis not gemmiferous. Most pinnæ 



sessile 238. Ü. Eygersii (Hieron.) C. Chr. 



10. Fertile pinnæ and segments contracted, 

 remote. Rachis gemmiferous. Most pinnæ 



stalked 239. D. biformata Ros. 



9. Veins 6 — 8-jugate, the basal ones truly anasto- 

 mosing. Upperside shortlv pubescent. 



240. 1). eciiiitaiis (Christ) C. Chr. 



