688 MINNESOTA BOTANICAL STUDIES. 



39. Physcia caesia (HOFFM.) NYL. 



On rocks, rare. Battle lake, June 23, 1900, no. 154. Leaf 

 hills, June 26, 1900, nos. 203 and 239. Thief River Falls, 

 July 18, 1900, no. 787. Red lake, August 4, 1900, no. 1078. 



40. Physcia obscura (EHRH.) NYL. 



On trees, common, and rarely on rocks. Battle lake, June 

 18, 1900, no. 4 and June 21, 1900, no. 121. Leaf hills, June 

 26, 1900, no. 211 and June 27, 1900, no. 270. Henning, June 

 29, 1900, no. 347 and June 30, 1900, no. 380. Bemidji, July 

 5, 1900, no. 461, July n, 1900, no. 622 and July 12, 1900, no. 

 690. Thief River Falls, July 18, 1900, no. 782, July 19, 1900, 

 no. 828 and July 28, 1900, no. 952. Red lake, Aug. i, 1900, 

 nos. 1027 and 1043 and Aug. 2, 1900, no. 1065. 



41. Physcia adglutinata (FLK.) NYL. 



On trees, infrequent. Red Lake, Aug. i, 1900, no. 1048. 



42. Sticta pulmonaria (L.) ACH. 



On cedars in swamp, rare. Bemidji, July 14, 1900, no. 727. 



43. Nephroma laevigatum ACH. 



On old cedars, in swamp, rare. Bemidji, July 14, 1900, no. 



723- 



44. Peltigera horizontalis (L.) HOFFM. 



On earth in woods, rare. Bemidji, July n, 1900, no. 645. 

 Thief River Falls, July 17, 1900, no. 752. 



Spores occasionally more than four-celled and frequently 

 narrower than usual. 



45. Peltigera refuscens (NECK.) HOFFM. 



On earth, rare or infrequent. Battle lake, June 21, 1900, no. 

 118. Henning, June 30, 1900, no. 372. Thief River Falls, 

 July 21, 1900, no. 862. 



46. Peltigera canina (L.) HOFFM. 



On earth, common. Battle lake, June 18, 1900, no. 14 and 

 June 20, 1900, no. 81. Henning, June 25, 1900, no. 186. 

 Leaf hills, June 26, 1900, no. 237. Thief River Falls, July 

 17, 1900, no. 751. Red lake, July 27, 1900, no. 933. 



47. Peltigera canina (L.) HOFFM. var. spuria ACH. 



On earth, frequent. Battle lake, June 20, 1900, no. 69. 

 Leaf hills, June 26, 1900, no. 223. Bemidji, July 9, 1900, 

 nos. 533 and 545. Thief River Falls, July 19, 1900, no. 809. 

 Red lake, July 27, 1900, no. 909. 



