LICHENS OF IOWA. 



71 



C. Stewart and Prof. J. C. x\rtluir furnished the material 

 from Story county. Prof. T. II. McBride and Mr. Bohumil 

 Shimek sent in collections from Johnson, Linn and Muscatine 

 counties. Professors II. M. Kelly and G. W. Newton sent 

 collections from Linn county. I*rof. J. C. Arthur loaned me 

 the- collections made by himself in Floyd and Dickinson 

 counties and those of Dr. Geo. E. Ehinger in Lee county, Mr. 

 R. I. CrallN in Emmet count}- and Mrs. E. W. D. Holway in 

 Winneshiek countv. 



1 am sure that I have been very fortunate in securiuL*" the 

 cooperation of other collectors, and I wish to v'erv heartilv 

 thank those who have contributed material. 



Of the first seventv-tive determinations made bv the writer, 

 about tift\' were examined by Mr. W. W. Calkins, of Chicago, 

 and twentv-rive bv Miss C. E. Cummings. of Wellesle)', 

 Mass. To both of these persons 1 am greatly indebted. 



Later I had access to the Tuckerman Herbarium of Har- 

 vard Universit}' for the purpose of comparing material, and I 

 wish to thank Dr. W. G. Farlow very heartily for this privi- 

 lege and for other aid in some difficult determinations. 



Through Mr. E. W. D. Hohvay I learned of some good 

 collections, and my thanks are due to him for this help. 



Sets of the species and varieties herein listed are d(;;posited 

 in Iowa at the State Agricultural College, at the State Univer- 

 sity, at Grinnell College, at the Upper low^a University, and 

 in the herbarium of Mr. E. \V. D. Holwav at Decorah. A 

 complete set will be found in the writer's herbarium, except 

 two species indicated in the list. These sets have all been 

 carefully compared, and it is hoped that they may be useful 

 in the further study of the Iowa lichens. 



This list doubtless is not even approximatelv a complete 

 one of the Iowa lichen flora. A few^ species are reserved 

 from those already collected for further study, and a careful 

 effort at collecting in any part of the State w'ill surely bring- 

 to light others not given in this list. 



Cambridge, Mass., 



