4 Department Circular 195, U. S. Dept. of Agriculture. 



reau of Plant Industry, where they are preserved in fireproof and 

 insect-proof steel cases. With proper safeguards, such material is 

 always accessible to accredited workers. 



Many specimens in the accompanying list have individual signifi- 

 cance in that they are duplicates of standard exsiccati sets ; in some 

 instances, noted as "Type coll.," they are of special value, because 

 they are from the same collections as the types used in specific de- 

 scriptions. Some of those here listed are duplicates of numbers in 

 the Mycological Exchange of 1902. Since agricultural experiment 

 stations and many other institutions may have such specimens in 

 their possession, it is requested that they avoid ordering these again, 

 because such action would prevent their more equitable distribution. 

 Holders of specimens issued from the list of 1902 may find it worth 

 while to note changes of name, especially for duplicates of types 

 since used in describing new species. In cases where these duplicates 

 here appear under a name different from that in the list of 1902 the, 

 fact is so noted, but where the name and data are identical these 

 alone establish the connection. These specimens have been identified 

 by competent taxonomists, in many cases by specialists in the groups 

 to which they belong. On special request an endeavor will be made 

 to furnish the name of the taxonomist to whom a specimen may have 

 been referred. There are chances for error, and where errors are 

 encountered it is desirable that they be reported to the Office of 

 Pathological Collections for correction and proper record. 



The nomenclature of this list is a matter of convenience, usage 

 giving preferential value. 



