Fink : LICHENS OF THE LAKE SUPERIOR REGION. 249 



53. Physcia caesia (HOFFM.) NYL. 



On rocks, frequent locally. Sterile. Gunflint, June 30, 

 1897, nos. 282 and 292. 



54. Physcia obscura (EHRH.) NYL. 



On rocks and trees, rare. Grand Portage island, June 23, 

 1897, no. 1450. Grand Portage, June 24, 1897, no. 172. 

 Tofte, July 12, 1897, no. 642. 



No. 1450 yielded spores a little large, - mic., and other- 



wise looks somewhat like P. pulverulent a (Schreb.) Nyl., but 

 is black below. Apothecia have hispid borders, and the thallus 

 is much smaller than that of any plants referred to the latter. 



55. Physcia adglutinata (FLOERK.) NYL. 



On trees, rare. Grand Portage, June 23, 1897, nos. 82a 

 and 



56. Pyxine sorediata FR. 



On rocks and trees, rare but widely distributed. Collected in 

 fruit three times. Gunflint, July I, 1897, no. 364, and July 2, 

 1897, no. 385. Misquah hills, July 3, 1897, no. 437. Tofte, 

 July 10, 1897, no. 633. Palisades, July 15, 1897, no. 746. 

 Two Harbors, July 7, 1897, no. 790. Snowbank lake area, 

 July 24, 1897, no. 912. 



57. Umbilicaria muhlenbergii (Acn.) TUCK. 



On rocks, common or abundant. Grand Portage (Mt. Jose- 

 phine), June 21, 1897, no. 53. Gunflint, June 30, 1897, nos. 245 

 and 246. Misquah hills, July 5, 1897, no. 537. Tofte (Carl- 

 ton peak), July 10, 1897, no. 602. Palisades, July 15, 1897, 

 no. 771. Snowbank lake area, July 24, 1897, no. 938. 



58. Umbilicaria vellea (L.) NYL. 



On rocks, common or frequent. Grand Portage (Mt. Jose- 

 phine), June 21, 1897, no. 57, and June 24, 1897, no. 178. 

 Gunflint, July i, 1897, no. 367. Misquah hills, July 3, 1897, 

 no. 430, and July 5, 1897, no. 538. Palisades, July 15, 1897, 

 no. 766. Snowbank lake area, July 24, 1897, no. 931. 



59. Umbilicaria dillenii TUCK. 



On rocks, common. Grand Portage, June 24, 1897, no. 170. 

 Gunflint, July I, 1897, no. 370. Misquah hills, July 3, 1897, 

 no. 429, and July 5, 1897, no. 445. Tofte (Carlton peak), July 



