240 ME. J. BALL ON THE FLORA OF NORTH PATAGONIA ETC. 



Aspidium capesse, Willd. (No. 2, G. C.) Also seen in Pata- 

 gonia. 



Adiantum cuneatlm, Lancjsd. No specimen iu the col- 

 lection. 



P.S. — Since the foregoing pages were in type I have received 

 the part relating to Botany of the official publication* respecting 

 the expedition to the Rio Negro under General Roca in 1879, 

 prepared by the late Professor Lorentz and Mr. Gr. Niederlein, 

 who was the botanist of the expedition. The Catalogue includes 

 324 species or varieties of flowering plants, and 13 vascular 

 Cryptogams. Of these 20 are described as new species, and as 

 many as 66 are merely assigned to genera, but not specifically 

 determined. Of the 258 named species of flowering plants 

 only 53 are certainly identical with as many species in Mr. 

 Claraz's collection ; but I have reason to believe that a consider- 

 able portion of the unnamed species should also be included in 

 that category. To account for so large an amount of difference, 

 I may remark that the plants collected by Mr. Niederlein were 

 all found in the interior, while a majority of Mr. Claraz's plants 

 come from the coast-region. In both collections there are a good 

 many species not yet certainly known to grow in Patagonia 

 proper, as several of Mr. Niederlein's plants were found north of 

 the Rio Colorado. His journey was effected in autumn and 

 winter ; and many of the specimens being in bad condition, it is 

 easy to understand the difficulty of accurately determining the 

 species. It is probable that the discrepancy between the two 

 lists is partly due to differences between botanists working 

 under very different conditions. I have not seen authentic 

 specimens of many species named by MM. Lorentz and Nieder- 

 lein, and they have not seen the types on which Hooker and 

 Arnott and A. Gray have founded many species of this region. 



* Infornie Oficial de la Comision CientiGca Agregada al Estado Mayor 

 General de la Expedition al Rio Negro (Patagonia) bajo las ordenes del 

 General D. Juno A. Roca. Entrega II. Botanica. 4to, Buenos Aires, 

 1881. 



