THE COMPOSITION OF A DESERT 

 LICHEN FLORA* 



Bruce Fink 



The plants upon which the considerations to follow are based 

 were collected in the vicinity of the Carnegie Botanical Labora- 

 tory. The collections and field notes were made by Messrs. J. 

 C. Blumer and V. M. Spalding. The collecting was quite care- 

 fully done, and a considerably larger amount of material was 

 examined than the rather short list of species given below would 

 indicate. That the list falls considerably short of the entire 

 lichen flora of the area is indicated by the fact that each collection, 

 after the first, brought to light one or more new forms, though col- 

 lected at random and including a small number of species. How- 

 ever, lichens collected by persons not well acquainted with lichen 

 species are likely to be the more common, conspicuous and char- 

 acteristic ones. Therefore, some valuable conclusions can be 

 drawn from the study of these specimens, together with a state- 

 ment of problems which could be solved only through an ex- 

 haustive study on the ground, by one well acquained with lichens 

 and the problems and methods of work in ecology. The list of 

 species is as follows : 



1. End o car pis cum placodizans (A. Zahlbr.) Fink. 



2. Heppia deserticola A. Zahlbr. Bull. Torr. Bot. Club 35 : 300. 



1908. 



3. Heppia virescens (Despr.) Nyl. Syn. Lich. 2: 45. i860. 



4. Pyrenopsis Schaereri (Mass.) Tuck. Syn. North Am. Lich. 



1: 135. 1882. 



5. Collema sp., sterile. 



6. Synechoblastus coccophorus (Tuck.) Fink. 



7. Leptogium arizonicum A. Zahlbr. Bull. Torr. Bot. Club 35: 



299. 1908. 



* Contributions from the Botanical Laboratory of Miami University — II. 



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