IOWA ACADEMY OF SCIENCES. 163 



ADDITIONS TO THE BIBLIOGRAPHY OF NORTH 

 AMERICAN LICHENS. 



BY BRUCE FINK. 



While reading in the botanical library of the University of 

 Minnesota during the summer of 1H96, I noticed a number of 

 titles which had escaped Mr. W. W. Calkins, while preparing 

 his bibliography of North American lichens.* These I added 

 to some before noted in my own library and began a careful 

 search which extended through the summers of 1897 and 1898; 

 examining also the general library of the University of Minne- 

 sota. 



The work was begun simply to find articles for my own use; 

 but knowing the importance of having bibliographies as com- 

 plete as possible, I have concluded to publish what additions 

 I have been able to find. In the search for titles I have exam- 

 ined complete files of fifteen of our leading American scientific 

 periodicals, have looked through the best general botanical 

 bibliographies and have consulted various miscellaneous writ- 

 ings. Yet, I am sure that some articles have escaped me, as 

 I know too well the difiiculties encountered in hunting for 

 articles published in obscure places, and sometimes in papers 

 bearing titles which do not indicate the presence of anything 

 regarding lichens. 



Nearly all of the articles listed have been examined, and I 

 have repeated four or five of Mr. Calkins' titles because very 

 imperfectly cited. I have brought my list only to the date of 

 his publication, and in a future paper I shall hope to bring his 

 paper, my additions and any other titles that I may be able to 

 find, together for greater convenience of reference and to con- 

 tinue the work to include the list of papers published since 

 April 15, 1896, the date to which his bibliography extends. I 

 have attempted to follow, in general, the rules of citation of 

 the Madison Botanical consrress. 



*Oalkins, W. W. Bibliography of North American Lichenology, Chicago Acad. 

 Sci. 1 : 44-50, April 1896. 



