200 MINNESOTA BOTANICAL STUDIES. 



1901, no. 1053. Kettle falls, August 14, 1901, no. 1476. 

 Harding, August 19, 1901, no. 1587. 



50. Physcia obscura (Ehrh.) Nyl. var. endochrysea Nyl. 



On rocks, rare. Rainy Lake City, August 2, 1901, no. 11 27 

 and August 3, 1901, no. 1148. Harding, August 19, 1901, no. 

 1585 and 1611. Tower, August 23, 1901, no. 1683. 



51. Pyxine sorediata Fr. 



On cedars in swamps, rare. Emo, July 17, 1901, no. 652. 

 Koochiching, July 29, 1901, no. 991. Rainy Lake City, August 

 7, 1901, no. 1250. Harding, August 20, 1901, no. 1653. 



52. Umbilicaria hyperborea Hoffm. ? 



On rocks, common in western portion of the region. War- 

 road, July 4, 1901, no. 345. Oak island, July 9, 1901, no. 477. 

 Flag island, July 12, 1901, nos. 541 and 559. Blueberry island, 

 July 13, 1901, no. 587. Emo, July 22, 1901, no. 801. Rainy 

 Lake City, August 5, 1901, no. 1206. August 7, 1901, no. 

 1253 and August 8, 1901, no. 1298. Kettle falls, August 9, 

 1901, no. 1350 and August 15, 1901, no. 1495. Harding, 

 August 21, 1901, no. 1658. 



Part of the material seems much like Umbilicaria jiocculosa 

 Hoffm. 



53. Umbilicaria muhlenbergii (Ach.) Tuck. 



On rocks, frequent. Warroad, July 4, 1901, no. 346. Emo, 

 July 20, 1901, no. 767. Koochiching, July 27, 1901, no. 939. 

 Rainy Lake City, August 5, 1901, no. 1218. Kettle falls, 

 August 12, 1901, no. 1398. Harding, August 17, 1901, no. 

 1538. Tower, August 24, 1901, no. 1727. 



54. Umbilicaria vellea (L.) Nyl. 



On rocks, rare. Oak island, July 9, 1901, no. 478. Blue- 

 berry island, July 13, 1901, no. 595. Rainy Lake City, Au- 

 gust 7, 1901, no. 1268. Kettle falls, August 12, 1901, no. 

 1591. Tower, August 29, 1901, no. 1880. 



55. Umbilicaria dillenii Tuck. 



On rocks, infrequent. Blueberry island, July 13, 1901, no. 

 569. Rainy Lake City, August 3, 1901, no. 1134. Kettle 

 falls, August 12, 1901, no. 1397. Harding, August 17, 1901, 

 nos. 1536 and 1537. Tower, August 29, 1901, no. 1879. 



56. Umbilicaria pustulata (L.) Hoffm. 



On rocks, rare. Blueberry island, June 13, 1901, no. 571. 

 Rainy Lake City, August 3, 1901, no. 1335. Kettle falls, 



