694 MINNESOTA BOTANICAL STUDIES. 



caulon, Umbilicaria and Physcia furnish these interesting- 

 species, and notes concerning them will be found in the list 

 below. The collection seems to indicate that the species of 

 Cladonia are particularly abundant, and the finding of four 

 Umbilicarias in this region is not less surprising. It is also 

 worthy of note that two species of Parmelia fruit here which 

 do not further south. The notes concerning this fact will also 

 be found below in the list. 



In arrangement and synonomy I have followed Tuckerman's 

 Synopsis, which is likely to be the standard for some time in 

 the study of American lichens. 



LIST OP SPECIES AND VARIETIES. 



1. Ramalina calicaris (L.) Fr. var. fastigiata Fr. 



On trees. American islands, July, 1896, no. 24. 



2. Evernia prunastri (L.) Ach. 



On wood. Flag island, Aug., 1894, no. 2895. Ameri- 

 can islands, July, 1896, no. 25. 



3. Usnea barbata (L.) Fr. var. florida Fr. 



On trees. Main land, Huggins landing, July, 1894, no. 

 1575. Flag island, Aug., 1894, no 28956. 



4. Usnea barbata (L.) Fr. var. birta Fr. 



On trees. American islands, July, 1896, no. 27. 

 Not previously reported from Minnesota. 



5. Usiiea barbata (L.) Fr. var. plieata Fr. 



On trees. Flag island, Aug., 1894, no. 2895c 



6. Theloschistes chrysopthalmus (L.) Norm. 



On trees. Garden island, June, 1894, no. 401. 



7. Theloschistes polycarpus (Ehrh.) Tuck. 



On trees and dead wood. War Road river, June. 1894, 

 no. 500. Big island, July, 1894, no. 2245. American 

 islands, July, 1896, nos. 10 and 11. 



Two distinct forms are placed here, one having a green- 

 ish-yellow thallus and yellow apothecia, and the other 

 having fulvous thallus and apothecia. The latter tends 

 toward the next. 



8. Theloschistes lychneus (Nyl.) Tuck. 



On trees. American islands, July, 1894, no. 2273. 

 American islands, July, 1896, no. 9. 



