207 
10. Leaf thinner, dark-green; costz and costules 
not stramineous. Pinn: in very distant, op- 
posite pairs, the basal ones reflexed. 
252. D. Fraseri (Mett.) O. Ktze. 
6. Basal pair of veins normally united ; in most species the 
next 2—3 pairs of veins are connivent to sinus and 
often alternately anastomosing into a flexuose common- 
branch, which runs to sinus. 
lb. 
Pinne entire, serrulate or lobed but never cut !/; 
to the costa. Basal veins upcurved and anastomosing 
under acute angles, the following pair as a rule also 
anastomosing. 
8. Leaf practically glabrous; in some species the 
rachis and coste beneath are minutely pube- 
rulous. Sporangia glabrous, or (in D. obliterata) 
deciduously setose. 
9. Both surfaces densely warted. Pinna 2—4 to 
auside do. cd tak SE ree 258. D.juruensis n. sp. 
9. Surfaces not warted. Several pairs of pinne. 
10. Pinnz entire or very shallowly serru- 
late. Basal veins spring out from. the 
costule 1 mm above the costa. 
255. D. vivipara (Raddi) C. Chr. 
10. Pinnz broadly serrate or lobed 'i: or a 
little more. Basal veins spring out from 
the base of the costule or the posterior 
one from the costa. 
11. Only the lowermost pair of veins ana- 
stomosing, or all free. Rachis gemmi- 
ferous. 
12. Veins 4—6 jugate, the two basal 
one as a rule not united and not 
reaching the sinus. 
256. D.straminea (Bak.) C.Chr. 
12. Veins 8—9 jugate, those of the 
basal pair united..... 257. D. Góldii n. sp. 
11. At least 2 pairs of anastomosing veins. 
Rachis rarely gemmiferous. 
19. Terminal pinna small, often abort- 
ive. Pinne few, wrinkled, 5—8 
cm long. Veins 4—5-jugate. 
260. D. nigrescentia (Jenm.) C. Chr. 
13. Terminal pinna confluent 
with the upper lateral ones. 
227. D. hastata (Fée) Urb. 
13. Terminal pinna distinct. 
259. D. obliterata (Sw.) C. Chr. 
8. Lamina rather densely pubescent throughout 
beneath. Sporangia densely setose. 261. D. Rolandii n.sp. 
7. Pinne incised to the middle or deeper. Only the 
basal pair of veins anastomosing under broad angles. 
8. Coste beneath puberulous by stellate hairs. 
240. D. equitans (Christ) C. Chr. 
2 
