14 MINNESOTA BOTANICAL STUDIES. 



14. Physcia aquila (Ach.) Nyl. var. detonsa Tuck. 

 On igneous rocks and sandstone, nos. 42 and 86. 

 Not previously reported from Minnesota. 



15. Physcia pulverulenta (Schreb.) Nyl. 

 On igneous rocks and sandstone, no. 73. 



16. Physcia stellaris (L.) Tuck. 

 On igneous rocks, no. 2. 



17. Physcia tribacia (Ach.) Tuck. 

 On igneous rocks, nos. 55 and 77. 



18. Physcia caesia (Hoffm.) Nyl. 

 On igneous rocks, no. 30. 



19. Physcia obscura (Ehrh.) Nyl. 

 On igneous rocks, nos. 5 and 47. 



20. Pyxine sorediata Fr. 

 On igneous rocks, no. 48. 



21. Umbilicaria dillenii Tuck. 

 On igneous rocks, no. 87. 



22. Nephroma helveticum Ach. 

 On igneous rocks, no. 26. 



Not previously reported from Minnesota. 



23. Peltigera pulverulenta (Tayl.) Nyl. 

 On earth among igneous rocks, no. 15. 



24. Peltigera rufescens (Neck.) Hoffm. 

 On earth among igneous rocks, no. 17. 



25. Peltigera canina (L.) Hoffm. 



On earth among igneous rocks and on sandstone, nos. 16 and 

 28. 



26. Peltigera canina (L.) Hoffm. var. spuria Ach. 

 On sandstone, no. 119. 



27. Peltigera canina (L.) Hoffm. var. sorediata Sch^r. 

 On sandstone, no. 96. 



28. Pannaria languinosa (Ach.) Koerb. 

 On igneous rocks and sandstone, no. 20. 



29. Pannaria microphylla (Sev.) Delis. 

 On igneous rocks and sandstone, no. 35. 

 Not previously reported from Minnesota. 



30. Ephebe solida Born. (?) 

 On igneous rocks, no. 59. 



The specimens were sterile and must be regarded as uncer- 



