696 MINNESOTA BOTANICAL STUDIES. 



19. Physcia hispida (Schreb., Fr.) Tuck. 



On trees, sterile. American islands, July, 1896, no. 17. 



This northern species has not been reported before 

 from central - northern United States. It occurs com- 

 monly in New England, and Hall has reported it from 

 Oregon. 



20. Physcia cassia (Hoffm.) Myl. 



On trees. American islands, July, 1896, no. 51. 



21. Physcia obscura (Ehrh.) Nyl. 



On trees. American islands, July, 1896, no. 18. 



22. Umbilicaria mnhlenbergii (Ach.) Tuck. 



On granitic rocks. Massacre island, July, 1894, no. 

 2619. American islands, July, 1896, no. 30. 

 Not previously reported from Minnesota. 



23. Umbilicaria vellea (L.) Nyl. 



On granitic rocks. Massacre island, July, 1894, no. 

 2597. 



Not previously reported from Minnesota. 



24. Umbilicaria dillenii Tuck. 



On granitic rocks. Massacre island, July, 1894, no. 

 2619a. American islands, July, 1896, no. 31. 



25. Umbilicaria pustulata (L.) Hoffm. 



On granitic rocks. American islands, July, 1896, no 42. 



The last two were listed by the writer as from Wiscon- 

 sin or Minnesota in Proc. Iowa Acad. Sci. 1894. Other- 

 wise, these four Umbilicarias have not been reported be- 

 fore from central- northern United States. 



26. Peltigera cauina (L.) Hoffm. 



On earth. Elmer point, Aug., 1894, no. 2800. Amer- 

 ican islands, July, 1896, no. 28. 



Varying from oretty good forms to the first variety 

 below. 



27. Peltigera cauina (L.) Hof fm. var. spuria Ach. 



On earth. Shoal lake island, July, 1894, no. 1038. 

 Massacre island, July, 1894, no. 2618. Island near North- 

 west angle, Aug., 1894, no. 3227. 



Not previously reported f rom Minnesota. 



