78 TKAXSACTIONS AND PKOCEEDINGS OF THE [Sess. lviii. 



DiPLACHNE VERTiciLLATA, Xees et Mey. 



Hab. — Forests near mouth of Eio Pilcomayo. 



Cheilanthes microphylla, Sw. 

 Hab. — Same locality as last. 



Cheilanthes pedata, a. Br. 

 Hab. — Kio Paraguay. 



Cheilanthes eauiata, E. Br. 



Hab. — Forests near mouth of liio Pilcomayo. 



Pteris palmata, AVilkl. 



Hab. — Common on prostrate tree trunks in damp forests 

 on the Lower Pilcomayo. 



Xephrodium molle, Desv. 



Hab. — Common in forests of Lower Pilcomayo. 



POLYPODIUM ANGUSTUM, Mett. 



Hab. — On prostrate trunks in same locality as the 

 preceding species. 



POLYPODIUM INCAXUM, Sw. 



Hab. — Forests of Lower Pilcomayo. 



Gymnogramme ecfa, Desv. 



Hab. — On prostrate tree trunks in forests of Lower 

 Pilcomayo. 



Anemia to.mentosa, Sw. 

 Hab. — Piio Pilcomayo. 



AzoLLA magellanica, AVilld. 



Very abundant upon fresh-water lagunas everywhere, 

 forming a continuous carpet over their surface, green in the 

 younger plants, reddish in the older. Sporangia developed 

 during July, August, and September, i.e., as the waters 

 dry up and the plants are left stranded. 



USXEA BARBATA, var. CERATINA, Sch. 



Prov. Arg., Barhara del niontc. 



Hab.— Abundant on trees in the montes of the 

 Pilcomayo. 



