51 103 
An andine representative of D. falciculata, resembling it in size, habit and 
lexture but differing by the following characters: Stem proportionally long, 5 dcm; 
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 
costz beneath with several, small, dark-brown scales, which from an almost cir- 
cular, subbullate basal part formed by large isodiametric cells and often furnished 
with some long cilies 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 pinnz often some- 
what shorter, the anterior basal one of the upper pinne 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 pinnz 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. sefosum Kl. differs only by its somewhat longer 
petioles of the lower pinnz; 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, W); Vallée de Córdoba, 
Bourgeau nr. 1644 (B, H, S, W = A. deltoideum Fourn.), H. Fink nr. 55 part. (W). 
Honduras, San Pedro Sula, TurgME ed. Donn. SurrH nr. 5646 (C, W). 
Costa Rica, WrenckLÉ 1904 (C); Turrialba, A. et C. BRADE nr. 344 (R); Grenadilla Finca Hermes, A. et 
C. BnapE nr. 414 (HR). 
Panama: Maxow nr. 5172 (W). 
Colombia: Santa Marta, H. H. SwrrH nr. 2581 (C). 
Venezuela: Tovar, Moritz nr. 204 part, (B, C, S, = A. sefosum 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 
by 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: Foréto de Tuis, ToNpuz nr. 11333 (C! also W). 
Intermediate between JD. 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 costz and costule with scattered, short, thick hairs. Stipe 
up to 25 cm long, slender, throughout glanduloso-pubescent and fibrillose by thin, 
14* 
