326 80 



scattered hamate hairs. Texture firm, chartaceous; colour brown. Segments close, 

 a litle falcate, acute, about 4 mm. broad, their edges slightly revolute, the basal 

 pair considerably reduced in the lower pinnæ, equal-sized in the upper; the 

 sinus between the segments acute narrow. Veins about 15 to a side, prominent 

 on the upperside. Sori small, a little above the middle of the vein, soon dis- 

 persed, exindusiate. 



Polypodhim ctenoides Jenman seems to me to be the same species, judging 

 from a fragment from Jamaica, leg. et det. Jenman (HB). Il is probable that 

 Jenman was right in naming his plant P. ctenoides, but having seen no specimen 

 from San Domingo, the type locality of Plegopteris ctenoides Fée, I dare not 

 identify the species of Fée with D. rudis. 



D. Leprienrii (Hk.) O. Ktze. is a near relative of D. rudis, resembling it very 

 closely in general habit, but it belongs to the group of species, which have their 

 lower pinnæ not at all reduced and which, therefore, are not included in this 

 paper. 



74. Dryopteris Engelii Hieron. Hedwigia 46: 339. tab. 6 fig. 12. 1907. 



Type from Venezuela: Mérida, leg. Engel n. 90 (HB!). 



Doubtful if specifically different from D. rudis. It is to that species as D. 

 Mercurii is to D. Sprengelii. 



75. Dryopteris nervosa (Kl.) C. Chr. Ind. 279. 1905. 



Syn. Polypodiiim nervosum Klotzsch, Linnaea 20: 386. 1847; Nephrodium ner- 

 vosum Hieron. Engl. Jahrb. 34: 445. 1904. 



Type from British Guiana, leg. Schomburgk n. 1165 (HB!). — Also in 

 Costa Rica, C. Wercklé 1903 (HC). 



Rhizomate? Stipitibus (ad pinnas abortivas infimas) 2 dem. longis, validis, 

 minute pubescentibus. Lamina lanceolata, 1 m. longa, 2'/3 dem. lata, ad basin 

 abrupte attenuata, rigide membranacea vel subcoriacea, nitida, eglandulosa, subtus 

 ad costas costulasque hispido-setosa et inter venas minute pubescente vel fere glabra, 

 supra costulis setosis exceptis glabra, marginibus sparse ciliata. Pinnis numerosis, 

 alternis, oblongis, longe acuminatis, maximis 10 — 12 cm. longis, 2 cm. latis, ad 

 basin aërophoro squamaeforme instructis, inferioribus 6 — 7 jugis valde reductis, 

 imis glanduliformibus (Typus IV). Laciniis numerosis, ala 1 mm lata connectis, 

 patentibus, acutis, basalibus subaequalibus. Venis 12 — 14 jugis, utrinque prominulis, 

 costis coslulisque stramineis. Soris parvis, medialibus, a marginibus subrevolutis 

 non obtectis. Indusio non reperto. 



I have redescribed this species after Wercklé's specimen, which very well 

 agrees with the somewhat imperfect original one. D. nervosa is intermediate between 

 D. rudis and D. cheilanthoides, differing from the former by its narrower and not 

 throughout setose leaf, from the latter by its margins not being much revolute 



