36 
IOWA ACADEMY OF SCIENCES. 
hoped that the bibliography may be published at an early 
date, and in the interval any suggestions from botanists as 
to omissions or errors in statement will be very welcome 
and will receive careful consideration. Finally, in closing 
I wish to express my thanks to many American and Euro- 
pean lichenists, and to other botanists of our country, who 
have answered many questions and aided in looking over 
literature. Also I am under obligations to the lichenists 
of two continents for the photographs from which the 
lantern slides shown were made. 
APPENDIX. 
At the last moment it has seemed best to give some state- 
ment regarding bibliography; and since it is impossible to 
give a complete statement of all titles with adequate ex- 
planation as to contents in all instances, it has seemed best to 
add here the names of all authors in whose papers anything 
regarding lichens has been found. With these names ap- 
pears the year in which the first article by the author 
containing any reference to North American lichens ap- 
peared, and this is followed by a figure indicating the 
number of such titles by the author. While this presenta- 
tion is not all that could be desired, it is hoped that it may 
prove useful to workers in American lichenology; and I 
shall also be glad to aid any especially interested from my 
bibliography cards which give full data. The whole number 
of articles indicated by the numbers after each author’s 
name is considerably more than 443. This is due partly to 
a repetition in instances of joint authorship, and in part 
also to the finding of some additional titles and authors 
after the address was delivered. Finally, I shall be very 
greatly obliged to botanists for any additions to the authors 
or numbers of titles indicated, or for any earlier dates of 
publication of any thing containing references to lichens 
by any of the authors. 
