204 
152 
9. Lower 1—3 pairs of pinnz more or less 
reduced. Basal veins often united. Lobes 
patent with open sinuses between. Pinnz 
numerous. Jamaica. 
10. Indusium small. Sori medial or infra- 
medial. Veins 6—-8-jugate. Pinnz rarely 
incised to the middle. 233. D. usitata (Jenm.) C. Chr. 
10. Indusium large, glabrous. Sori supra- 
medial. Veins 10—12-jugate. Pinnz in- 
cised above the middle. 
234. D. venusta (Hew.) O. Ktze. 
7. Most pinne short-stalked. 
8. Veins all simple, the lower ones connivent to 
sinus, rarely united. Leaf-tissue glabrous. 
228. D. pyramidata (Fée) Maxon. 
8. Basal veins united and the upper ones often 
fureate. Both surfaces pubescent: 
220. D. bermudiana (Bak.) Gilb. 
6. Rhizome creeping. Brazilian species. 
7. Pinnz scarcely incised to the middle, their base 
truncate, hairy beneath; veins 6—7-jugate. 
244. D. Schwackeana Christ n. sp. 
7. Pinnz incised above the middle, lower ones nar- 
rowed towards the base. 
8. Rachis and coste beneath without scales. 
Lower pinnz sessile, lobed to the base.. 
236. D. scabra (Pr.) C. Chr. 
8. Rachis and coste beneath with small scales. 
Lower pinnez short-stalked with a short, entire, 
cuneatebaset ec E 237. D. monosora (Pr.) C. Chr. 
Rachis and underside with erect, anchor-shaped hairs. 
Basaluveinstunitedcl* . odd eem 247. D. ancyriothrix Ros. 
Rachis and cost beneath densely pulverulent by short, stel- 
late hairs. which are often intermixed with longer, simple 
hairs, or, the latter predominating, densely tomentose. 
Indusium hairy by simple hairs or glabrous. Leaf-tissue 
of both sides glabrous or hairy by simple hairs. 
6. Indusium setose. 
7. Andine species. Rhizome erect (always?). Rachis 
and coste beneath without scales. 
8. Rachis (and costs beneath) without thick, long 
hairs, but densely stellato-pulverulent. 
9. Veins 10—16-jugate, the basal ones connivent 
to sinus. Upperside (cost excepted) glabrous. 
10. Fertile pinnze and segments not contrac- 
ted; rachis not gemmiferous. Most pinnz 
SESSILe 2 fete. 238. D. Eggersii (Hieron.) C. Chr. 
10. Fertile pinnz and segments contracted, 
remote. Rachis gemmiferous. Most pinnz 
stalked . 4 ...... 239. D. biformata Ros. 
9. Veins 6— 8-jugate, the basal ones truly anasto- 
mosing. Upperside shortly pubescent. 
240. D. equitans (Christ) C. Chr. 
