MEMOIRS 
“TORREY BOTANICAL CLUB 
Notes on Lichen Distribution in the Upper Mississippi Valley 
By Bruce FINK 
Under the above caption I shall discuss briefly certain features 
regarding past investigations of the distribution of lichens within 
the northern portion of a somewhat extended biological area, and 
make certain suggestions as to the amount and kind of work yet 
needed to an approximate completion of the study of these plants 
within the area treated. Since it has been the custom, in the 
region under consideration, for states to engage more or less ex- 
tensively in botanical surveys, quite a number of papers have ap- 
peared, from time to time, dealing wholly or in part with lichen 
distribution within certain states or parts of states. Titles of these 
and other papers upon which this report is largely based are given 
in a bibliography of thirty-two titles. 
Since a definite statement as to territory covered may be ad- 
vantageous at the outset, I may state that I have confined myself 
to the following states: Missouri, Kansas, Nebraska, South Da- 
kota, Minnesota, Wisconsin, Iowa, Illinois, Indiana, and Ohio. 
This list of states includes, so far as I have been able to ascertain 
through published bibliographies and correspondence with bota- 
nists, all the states in the upper valley in which any investigations 
of the lichen flora have been made and which do not extend into 
the mountainous regions to the east or west of the area selected. 
If any botanist can suggest to me any paper, bearing upon the 
subject, which I have overlooked, or any unpublished work which 
should receive consideration, he will confer a great favor and aid 
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