VIII. LICHENS COLLECTED DURING THE SUMMERS OF 



1912 AND 1913 IN THE THUNDER BAY DISTRICT, 



ONTARIO, CANADA. 



By R. Heber Howe, Jr. 



In December, 1913, Dr. O. E. Jennings, of the Carnegie Museum, 

 Pittsburgh, Pa., forwarded to me a collection of 265 packets of lichens 

 collected by himself and Mr. R. H. Daily in the early part of the 

 summer of 1912; by himself, Mr. R. H. Daily, and Mrs. O. E.Jennings 

 during the remainder of the summer; and by himself and Mrs. 

 Jennings in the summer of 191 3. These collections were made in 

 the southern part of the Thunder Bay District of Ontario, a district 

 lying directly to the north of Lake Superior and surrounding Lake 

 Nipigon. The region covered extended about two hundred miles 

 east and west. The collection, though rich in specimens, was not so 

 in species. It adds, however, a species and a variety to our North 

 American lichen flora before unrecorded, and contains two interesting 

 Cladonias, which are noted below. The collection also plainly shows 

 the fact that our typical eastern plants extend uninterruptedly at 

 least as far west as Lake Superior. Eastern species, such as PJatysma 

 lacunosum var. atlanticum Tuck., occur with other such typical plants, 

 whereas western species like Alectoria Jremontii Tuck. (Montana and 

 Wyoming) and Letharia vulpina (L.) Ach. (Nebraska, Wisconsin and 

 Minnesota) were not found. In regions lying well to the foothills of 

 the Rockies these latter species are represented and the line that 

 separates the floras lies somewhere between these two points or in 

 the actual valley of the Mississippi river (95th meridian). 



A complete set of the specimens is preserved in the herbarium of 

 the Carnegie Museum; duplicates of many are to be found in the 

 author's herbarium, and in the herbarium of the Sullivant Moss 

 Society. 



The majority of the crustose species were determined by Dr. H. E. 

 Hasse; the StereocauJons by Dr. L. W. Riddle; the Cladonias by 

 Dr. Ludwig Scriba. To these gentlemen most grateful thanks are 

 due. 



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