1918] 
ZELLER AND DODGE—RHIZOPOGON 3 
satisfactory study of the development of the fruit-bodies has 
been made by those to whom fresh material in all stages is 
accessible. 
Although we have had the opportunity to study a few 
specimens which were put up in alcohol, our descriptions are 
based on dry herbarium specimens, as is also our key. As a 
standard for color descriptions we have used Ridgway, 
‘Color Standards and Nomenclature,’ Washington, D. C., 
1912. As to the citation of specimens, the data given are those 
received with the specimens. The location of all specimens 
is designated by aa in parenthesis the name of the her- 
barium preceded by ‘‘i 
We gratefully RE all who have aided us in the 
study of herbarium material, making possible this record of 
species of Rhizopogon. We are thus indebted to the Missouri 
Botanieal Garden for the use of library and herbarium facil- 
ities; to Dr. E. A. Burt for helpful suggestions and aecess 
to his private herbarium; to Dr. LeRoy Abrams for the op- 
portunity to study specimens from the Dudley Herbarium of 
the Leland Stanford Jr. University; to Prof. G. F. Atkinson 
for specimens from his herbarium; to Dr. H. M. Fitzpatrick 
for specimens from the Department of Plant Pathol- 
ogy Herbarium, New York State College of Agriculture at 
Cornell University; to Dr. N. L. Gardner for access to his own 
collections of Rhizopogon; to Dr. H. D. House for permitting 
us to study the collections in the New York State Herbarium; 
to Mr. C. G. Lloyd for access to the extensive collection of 
Rhizopogon in his herbarium; to Dr. W. R. Maxon for send- 
ing us specimens from the United States National Her- 
barium; to Dr. W. A. Murrill for the opportunity to study 
the unmounted specimens of Rhizopogon in the New York 
Botanical Garden Herbarium; to Mrs. F. W. Patterson for 
the privilege of studying the specimens in the Pathological 
Collections, Bureau of Plant Industry, United States Depart- 
ment of Agriculture; and to Dr. J. R. Weir for specimens from 
Idaho. 
