158 106 



2. Group of D. decussata (Glaphijropteris proper). Lamina not narrowed 

 downwards and without glanduliform pinnæ. Still I find along the stipe of a spe- 

 cimen named Polypodiuin Perciualii, which is no doubt a form of D. decussata, 

 several long, projecting aërophores which certainly indicate the place of non- 

 developed pinnæ. Hachis and costæ beneath finely downy by short, simple hairs 

 that are deciduous; costæ above and margins very characteristically villous by 

 long, soft hairs. Veins very close and numerous. Sori exindusiate. 



Glaphijropteris is probably confined to tropical America. I do not know any 

 Old-World's species which can safely be referred hereto. The Himalayan D. eru- 

 bescens (Wall.) C. Chr. is similar in habit but otherwise quite different. 



Key. 



Lamina with 3 — 4 pairs of small, tuberculiform, abortive pinnæ along 

 the stipe. Costæ above antrorsely setose, beneath cinereo-tomentose 

 bj' sessile, branched hairs. Veins 15 — 20-jugate, not very close. 

 2. Under surface not glandular. Indusium present, but rarely seen. 



3. Sori medial or inframedial. Segments broadly obtuse, mem- 

 branous, shortly and rigidly setose above 171. D. Canadasii (Sod.) C. Chr. 



3. Sori supramedial. Segments acute, coriaceous, the upperside (costæ 



and veins excepted) glabrous 172. D. macradenia (Sod.) C. Chr. 



2. Under surface densely glandular 173. D. Thomsonii (Jenm.) C. Chr. 



Lamina without auriculiform and glanduliform, abortive pinnæ. Costæ 

 above and margins villous by long, soft hairs; rachis and costæ beneath 

 glabrous or more or less downy by simple hairs. Veins very close. 

 2. Veins about 16-jugate. No aërophore at the base of the costules 



beneath. Texture thin, herbaceous 174. Ü. mapiriensis Ros. 



2. Veins 25 — 60-jugate. Distinct aërophore at the base of the costules. 



Texture firm to coriaceous. 



3. Veins 25 40 jugate. Under surface densely glandular. Sori 



inframedial 175. Ü. decussata (L.) Urb. 



3. Veins 45 — 60-jugate. Under surface apparently eglandulose. 



Sori supramedial 176. D. polyphlebia n. sp. 



171. Dryopteris Canadasii (Sod.) C Chr.; Revision nr. 68 fig. 44. 



Area: Ecuador. — Sodiro describes the species as exindusiate; I have failed 

 to find indusia in authentic specimens. 



172. Dryopteris macradenia (Sod.) C. Chr.; Revision nr. 79. 



Area: Ecuador, Sodiro (authentic specimens in C and Kew!) 

 Closely related to the preceding species, but the lamina coriaceous, the seg- 

 ments acute and the sori supramedial. Basal segments much reduced. 



