190 138 



whitish hairs. Segments falcate with revolute edges. Veins 18-20 to a side. Sori 

 supraniedial, furnished with a very densely hairy indusiuni. Dimensions: Stipe 

 6—8 dem long, 1 cm thick; lamina 1 m or more long; pinnæ up to 35 cm long, 

 3'/2 cm broad, but generally smaller. 



198. Dryopteris Bangii C. Chr. Vid. Selsk. Skr. VII. 4: 333. 1907 with fig. 



Type from Bolivia, near Coroica, A. Miguel Bang nr. 2321 (H!, B). Differs 

 from all forms of D. patens and D. êuoIUs by its creeping rhizome, its thick qua- 

 drangular, very tomenlose rachis, its whole hairy appearance and rigid texture, 

 the lamina is narrowed downwards, and the venation is variable, even in the same 

 leaf, the lower veins now being united, now free. 



To this species I now refer a number of specimens from Southern Brazil. 

 Among these are some that perfectly agree with the Bolivian lype, while others 

 are more thin-leaved with the basal veins rather constantly united. A majority of 

 the specimens were named Dr. patens var. decrescens by Bosenstock (Hedwigia 

 4G: 114. 1907) and Aspidium conspersum Fée, Cr. vase. Br. 1; 143. 1869 (vix Schra- 

 der) is apparently the same. Some of these specimens are very large, having 

 pinnæ up to 20 cm long by 2 cm wide, in general habit very much resembling 

 D. patens, from which species they differ by creeping rhizome, basal scales (which 

 resemble those of D. mollis) and the downwards narrowed lamina. 



This form can be named var. patentiformis Bos. — (The specimens deter- 

 mined by me during these last years are named on the labels Dryopteris patenti- 

 formis Bos.) 



Besides the specimens enumerated by Bosenstock (loc. cit.) I have among 

 others seen the following, all from Brazil: 



Minas Geiaes, Caldas, Mosen nr 2172 (H, L, Rg, S), 2173 (Rg); Lagoa Santa, Wahming nr. 788 (H); 

 Serra de Ouropreto, Schwacke nr. 10231 (C); Itaculumy, Schwache nr. 14489 (C) — Rio, 

 Glazidu nr. 23G0 (H); Blanchet nr. 2635 (H) — Sta. Catharina, Rlumenau, Haerchen ed. 

 RosENSrocK, Fil. austr. bras. e.\s. nr. 198 (Rgl — Parana, Sena do Mar, Dusén nr. 3725 (C) 

 — Rio Grande do Sul, Rio Pardo, C. Jürgens ed. Rosenstock, Fil. austr. bras. exs. nr. 

 264 (B, C, R, Rg, W). 



Another critical form is that named D. parasitica var. procurrens by Bosen- 

 stock (Hedwigia 4G; 131. 1907) and distributed by him in his Fil. austr. bras. exs. 

 nr. 356 (B, Bg). It is of a thinner texture, with a more slender rachis and the 

 veins constantly anastomosing. It may be a form of D. mollis with creeping 

 rhizome, but I am inclined to consider this and several other critical forms all 

 being forms of a single, very variable species, D. Bangii. 



199. Dryopteris urens Bos. in Fedde, Bepert. 4: 5. 1907, C. Chr., Vid. Selsk. 



Skr. VII. 4: 332. 1907, with fig. 



Type from Uruguay, Punla Ballena, Arechavaleta (B) and Berro (CC). 

 Besembles very much some of the thin-leaved forms referred to under the 



