123 175 
4. Pinnae 15—20 cm long by 2—2'/2 cm broad, thinly herba- 
CCOllsi) dU Pm OPE i mus t LOUER EM OH MITOORNED)TTTERSREROS: 
2. Rhizome creeping. 
3. Rachis not or very indistinctly scaly. Basal scales ferruginous, 
narrow-acuminate, as a rule hairy. 
4. Lower pinnz not shortened. 
5- Basiscop lower segments of lower pinnze not or slightly 
reduced. Pinnz seldom more than 10—15 cm long, 2 cm 
broad; veins 6—10-jugate. 
6. Veins not prominent beneath. Lower pinne not nar- 
rowed towards their base. No scales on rachis and 
Costa mE sc MAH cca hae e - 192. D. normalis C. Chr. 
6. Veins more or less prominent beneath. Lower pinne 
more or less narrowed towards their base. Rachis 
and coste beneath oflen with small hairy scales. 
7. Lamina herbaceous or membranous without a di- 
stinct terminal pinna. Veins not close. 
8. Underside decidedly pubescent. Cuba and Cen- 
iraliAmericae eec cc LIS Ds angescens (luk.)) Gy Chi: 
8. Underside practically glabrous. Argentina and 
Daraguay Math undae fees: 194. D. Berroi C. Chr. 
7. Lamina coriaceous with a distinct terminal pinna. 
Veins close, the lower 4 connivent to sinus. Pinna 
generally long and narrow ...... 195. D. serra (Sw.) O Ktze. 
5. Basiscop lower segments of lower pinnz abortive or per- 
fectly obsolete. Pinnz up to 50 cm long by 3—4 cm 
broad. Veins 15—20-jugate, the lower 2—4 connivent to 
ESI 3 ROC RUECE ED Tr MEE ED 196. D. oligophylla Maxon. 
4. Lower pinne shortened. Leaf throughout much hairy. 
Lamina firm often coriaceous. Habit of D. patens. 198. D. Bangii C. Chr. 
5. Lamina thinly herbaceous, the hairs burning. Habit of 
Dismollisi peers ot ices Up enc Aet o n99DATensahos: 
3. Rachis and stipe densely scaly 197. D. Tuerckheimii (Donn. Smith) C. Chr. 
1. Basal tertiary veins normally united in the leaf-tissue, sending an ex- 
current branch to the sinus. 
2. Sporangia glabrous. Aérophore none. No veins connivent to sinus. 
3. Rhizome oblique or shortcreeping with narrow, ferruginous 
scales at the apex. Coste beneath without scales. Lamina gene- 
rally narrowed downwards. Pinn: sessile. 
4. Leaf herbaceous. Rachis slender ......... 200. D. mollis (Jacq.) Hier. 
4. Leaf firm to coriaceous. Rachis strong, quadrangular, very 
Iyaupy tod ot TES OS PCT. eine Lond cto E e 198. D. Bangii C. Chr. 
23* 
