66 CHEILANTHES PULVERACEA. 



commoner in the higher elevations. He found it between 

 Tonagaia and Roayaga, in the District of Villa Alta in the De- 

 partment of Oajaca, at an altitude of from five to six thousand 

 feet, also in the neighbourhood of Omegnen of Chinautla, in 

 the Department of Puebla, at an altitude of from seven to 

 eight thousand feet. 



Galleotti found it at Rio Grande de Lerma. 



The form of the frond is triangular-oblong, glabrous, bipin- 

 natifid, the pinnae being sub-opposite, sessile, and profoundly 

 pinnatifid. 



Segments linear-oblong; apex acuminate and sinuato-dentate. 



Stipes paleaceous at the base. 



Length of frond from twelve to eighteen inches. Colour 

 above deep green, beneath covered with a white farinose powder. 



For a frond I am indebted to Mr. R. Sim, of Foot's Cray. 



It may be procured of Mr. E. Sim, of Foot's Cray. 



The illustration is from Mr. Sim's frond. 



