190 138 
whitish hairs. Segments falcate with revolute edges. Veins 18—20 to a side. Sori 
supramedial, furnished with a very densely hairy indusium. Dimensions: Stipe 
6—8 dem long, 1 cm thick; lamina 1 m or more long; pinne up to 35 cm long, 
3'/2 em 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. mollis by its creeping rhizome, its thick qua- 
drangular, very tomentose 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 type, 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 RosENsTOCK (Hedwigia 
46: 114. 1907) and Aspidium conspersum Fée, Cr. vasc. Br. 1; 143. 1869 (vix Scuna- 
DER) is apparently the same. Some of these specimens are very large, having 
pinne up to 20 cm long by 2 cm wide, in general habit very much resembling 
D. palens, 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 Ros. — (The specimens deter- 
mined by me during these last years are named on the labels Dryopteris patenti- 
formis Ros.) 
Besides the specimens enumerated by RosENsTOCK (loc. cit.) I have among 
others seen the following, all from Brazil: 
Minas Geraes, Caldas, MosÉw nr. 2172 (H, L, Rg, S), 2173 (Rg); Lagoa Santa, Warmine nr. 788 (H); 
Serra de Ouropreto, Scu wackE nr. 10231 (C); Itaculumy, ScHwacke nr. 14489 (C) — Rio, 
Graziou nr. 2360 (H); BraANcHET nr. 2635 (H) — Sta. Catharina, Blumenau, HAERCHEN ed. 
RosENsTOCK, Fil. austr. bras. exs. nr. 198 (Rg) — Parana, Serra do Mar, DusÉN nr. 3725 (C 
— Rio Grande do Sul, Rio Pardo, C. JónGENSs ed. Rosensrock, Fil. austr. bras. exs. nr. 
264 (B, C, R, Rg, W). 
Another critical form is that named D. parasitica var. procurrens by ROSEN- 
stock (Hedwigia 46; 131. 1907) and distributed by him in his Fil. austr. bras. exs. 
nr. 356 (R, Rg). 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 crilical forms all 
being forms of a single, very variable species, D. Bangii. 
199. Dryopteris urens Ros. in Fedde, Repert. 4: 5. 1907, C. Chr., Vid. Selsk. 
Skr. VII. 4: 332. 1907, with fig. 
Type from Uruguay, Punta Ballena, ARECHAVALETA (R) and Brenno (CC). 
Resembles very much some of the thin-leaved forms referred to under the 
