302 PEEFACE. 



Scliott), and more recently by Dr. Rothrock, upon this Survey, and by 

 Mrs. Sumner, the wife of the commander of the United States forces at 

 Camp Bowie. Dr. Edward Palmer and a few other persons have also sent 

 Ferns from this region. In Western Texas and the eastern part of New 

 Mexico, Mr. Charles Wright, Mr. August Fendler, and Mr. F. Lindheimer 

 made large collections of plants, Ferns among them, between 1843 and 

 1852. 



The Ferns of the mountains of Colorado have been collected by Dr. 

 Parry and Messrs. Hall and Harbour in 18G 1-1864, by Dr. George Vasey in 

 1868, and by other botanists of the Interior Department Surveys, by Prof. 

 John Wolf, expedition of 1873 of this Survey, and especially by Mr. 

 Townshend S. Brandegee, who has resided several years at Canon City, 

 Colorado. Other parties have from time to time made small collections in 

 the same region. The Ferns of Northern Nevada and Utah, just on the 

 border of the region embraced in the following report, were collected by 

 Mr. Sereno Watson, of Clarence King's Survey of the 40th parallel, and to 

 a small extent in Utah by myself. From Southern Utah, Drs. Palmer and 

 Parry have sent good collections. 



From Southern Nevada very little in the way of Ferns has been 

 received. 



In order to extend the usefulness of this report, a few Ferns which 

 occur either in Texas or in the extreme Northwest, outside of our assigned 

 limits, and which are more or less likely to be found within them, are 

 inserted in their proper places. 



Several additional species have been received while I have been pre- 

 paring this report, and it is very probable that still other species will be 

 discovered in the future. 



The genera Scolopendrium, Camptosorus, Struthiopteris, Onoclea, Bick- 

 sonia, Schucea, Lygodium, and, most remarkable of all, Osmunda, have never, 

 to my knowledge, been discovered in any part of the territory west; of the 

 Rocky Mountains. 



DANIEL C. EATON. 



New Haven, Conn., Sept. 22, 1877. 



