51 103 



An andine representative of D. falciculata, resembling it in size, habit and 

 texture but differing by the following characters: Stem proportionally long, 5 dem; 

 lamina 5 dem long 2 dem broad, not ciliate and not glanduloso-pubescent, but both 

 surfaces with scattered, short and thick hairs of the common type. Rachis and 

 costæ beneath with several, small, dark-brown scales, which from an almost cir- 

 cular, subbuUate basal part formed by large isodiametric cells and often furnished 

 with some long ciliés are suddenly narrowed into a long, narrow, entire apex, which 

 is formed by longitudinal, narrow cells with thick cell-walls (fig. 3-^). Segments 

 subpatent or a little oblique, not falcate, generally distinctly serrate especially to- 

 wards the mucronate apex, the posterior basal one of the lower pinnæ often some- 

 what shortei-, the anterior basal one of the upper pinnæ generally enlarged. Veins 

 6 — 8 to each side, simple, sometimes dark-coloured. Sori medial or inframedial, 

 small, with a subpersistent, glabrous indusium. — In some specimens the basiscop 

 half of the basal pinnæ is much enlarged with deeply lobed segments and fur- 

 cate veins. 



D. nigrovenia is distributed from Mexico to Ecuador and it varies only a 

 little; the form described as A. setosiim Kl. differs only by its somewhat longer 

 petioles of the lower pinnæ; to that form belong the specimens from Venezuela- 

 Ecuador. I have seen the following specimens: 



Mexico: San Luis Potosi , Hac. of Tamasopo, Pringle nr. 3957 (B, C, H, S, \V); Vallée de Cordoba, 

 Bourgeau nr. 1644 (B, H, S, W = A. deltoideiim Fourn.), H. Fink nr. 55 part. (W). 



Honduras, San Pedro Sula, Thieme ed. Donn. Smith nr. 5646 (C. W). 



Costa Rica, Wercklé 1904 (C); Turrialba, A. et C. Brade nr. 344 (R); Grenadilla Pinea Hermes, A. et 

 C. Brade nr. 414 (R). 



Panama: Maxon nr. 5172 (W). 



Colombia: Santa Marta, H. H. Smith nr. 2581 (C). 



Venezuela: Tovar, Moritz nr. 204 part, (B, C, S, = A. setosum Kl.), nr. 457 (B). 



Ecuador: Andes quitenses, Spruce nr. 5721 (CC, RB). 



Further I refer here a specimen from 



Trinidad: Fendler nr. 125 (W). 



which, however, is very near D. falciculata, especially the specimens of that spe- 

 cies from Parahyba and Guiana ; thus it seems that the two species are connected 

 b}' intermediate forms occurring in Northern South America, where they meet. 



42. Dryopteris Tonduzii (Christ) C. Chr. Ind. 664. 1906. 



Syn. Aspidium Tonduzii Christ, Prim. Fl. Costaric. III. 34. 1901. 



Type from Costa Rica: Forêto de Tuis, Tonduz nr. 11333 (C! also W). 



Intermediate between D. nigrovenia and D. Lindeni resembling the former in 

 venation the latter in size and colour. It differs from D. nigrovenia by its thin, 

 light-green leaf, which is about 25 cm long by 13 cm broad, the leaf-tissue of both 

 surfaces glabrous but costæ and coslulæ with scattered, short, thick hairs. Stipe 

 up to 25 cm long, slender, throughout glanduloso-pubescent and fibrillose by thin, 



14* 



