194 MINNESOTA BOTANICAL STUDIES. 



894 and July 31, 1901, no. 1046. Rainy Lake City, August 3, 

 1901, no. 1165. Kettle falls, August 13, 1901, nos. 1358 and 

 1403. Harding, August 19, 1901, no. 1573. Tower, August 

 23, 1901, no. 1692. 



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



On trees, and infrequent, rarely wandering. Beaudette, June 

 18, 1901, no. 20. Warroad, June 26, 1901, no. 185. June 

 27, 1901, no. 207, June 28, 1901, no. 248, July 1, 1901, no. 

 297 and July 2, 1901, no. 332. Oak island, July 9, 1901, nos. 

 459 and 475. Emo, July 17, 1901, nos. 658 and 666 and July 

 22, 1901, no. 821. Koochiching, July 27, 1901, no. 938 and 

 July 31, 1901, nos. 1023 and 1045. Rainy Lake City, August 

 2, 1901, no. 1116. Kettle falls, August 12, 1901, no. 1401 

 and August 13, 1901, nos. 1413 and 1429. Harding, August 

 16, 1901, no. 1519. Tower, August 23, 1901, no. 1676 and 

 August 26, 1901, no. 1807. 



13. Usnea barbata (L.) Fr. var. hirta Fr. 



On trees, rare. Warroad, June 28, 1901, no. 245. Emo, 

 July 18, 1901, no. 716. Koochiching, July 25, 1901, no. 875. 

 Kettle falls, August 13, 1901, no. 1439 and August 14, 1901, 

 no. 1469. Tower, August 26, 1901, no. 1790. 



14. Usnea barbata (L.) Fr. var. ceratina Schaer. 



On trees, frequent, especially on cedars in swamps. Beau- 

 dette, June 18, 1901, no. 33. Emo, July 18, 1901, no. 715. 

 Rainy Lake City, August 3, 1901, no. 1176. Harding, Au- 

 gust 16, 1901, no. 1512 and August 20, 1901, no. 1637. Tower, 

 August 26, 1901, no. 1777. 



15. Usnea barbata (L.) Fr. var. articulata Ach. 



On trees, rare. Beaudette, June 24, 1901, no. 143. Emo, 

 July 18, 1901, no. 711. Harding, August 20, 1901, no. 1636. 

 Not previously reported from Minnesota. 



16. Usnea longissima Ach. 



On cedars in swamps, locally common. Kettle falls, August 

 15, 1901, no. 1584. 



17. Usnea cavernosa Tuck. 



On trees, usually cedars in swamps, frequent. Beaudette, 

 June 18, 1901, no. 4. Warroad, July 2, 1901, no. 322. Oak 

 island, July 9, 1901, no. 437. Emo, July 17, 1901, no. 677. 

 Koochiching, July 25, 1901, no. 874 and July 31, 1901, no. 

 1032. Kettle falls, August 13, 1901, no. 1354. Harding, 



