BOLETI OF THE UNITED STATES 
Boleti are such fleshy and perishable fungi and in the 
dried state generally lose so much of their natural color and 
character that their study is attended with some difficulty. 
This difficulty has in some cases been increased by imper- 
fect and incomplete descriptions and unsatisfactory classifi- 
cation. Professor Fries, than whom probably no one has 
had a better knowledge of them, says “no genus has given 
me more trouble than that of the Boleti.” The following 
pages are the result of a desire on the part of the writer to 
facilitate the study of the, United States species by bringing 
together the descriptions of them, and arranging them in 
their respective tribes or groups. In the Hymenomycetes 
Europzi one hundred species are recorded, in the following 
pages one hundred and ten. Doubtless this number will 
gradually be increased with the advance of our knowledge 
of this part of our flora, for many parts of our country yet 
remain to be mycologically explored. Thirty-six of the 
species here described occur also in Europe. The large 
number remaining indicates a rich and a peculiar boletous 
flora. It has been necessary to institute two tribes, not rep- 
resented in Europe, for the reception of species for which 
no place is found among the Friesian tribes. A few species 
have been left unclassified in consequence of the imperfect 
_ character of their descriptions. A few unpublished species 
