XII. DETERMINATIONS OF SOME MINNESOTA 



LICHENS. 



W. D. Frost. 



The following list of lichens includes some of the most com- 

 mon species in the state. Most of them have been collected 

 by the staff of the Geological and Natural History survey 

 during the years 1891 and 189*^. The nomenclature is provis- 

 ional, and the arrangement followed is that of Nylander, as out- 

 lined in his Synopsis Methodica Lichenum. 



The writer is indebted to Mr. W. W. Calkins for the deter- 

 mination of the species of Graphis. 



€ALICIEI Nyl. Syn. 1 : 141. 1860. ♦ 



1. Trachylia tigillaris Fr. Scand. 282 1810. 



On fence rails, Litchfield, Meeker county, (W. D. F., 

 V June, 1892). 



CLADONIEI Nyl. Syn. 1:186. 1860. 



2. Cladonia pyxidata (Linn.) Fr. L. E. 216. 1831. 



On ground, near Minneapolis, {W D. F., June, 1892). 

 Brainerd, {E. P. Sheldon, June, 1892). On old logs, 

 Mora, Kanabec county, {E. P. Sheldon, July, 1892). 



3. Cladonia verticillata Flk. Clad. 26. 1828. 



Loiv ground, near Litchfield, Meeker county, {W. D. F., 

 June, 1892. 



4. Cladonia mitrula Tuckerm. Darlingt. Fl. Cestr. Ed. III. 



444. 1853. 

 On sandstone, Osceola, Wis. {W. D. F, Sept., 1892). 



5. Cladonia cristatella Tuckerm. Proc. Am. Acad. 5:394. 



1862. 

 On decayed stumps, near Minneapolis, {W. J). F., May, 

 1891). Spicer, Kandiyohi county, (TF. D. F, Aug., 

 1892). Osceola, Wis. (W. D. F., Sept., 1892). Brain- 

 erd, {E. P. Sheldon, June, 1892). 



