260 MINNESOTA BOTANICAL STUDIES. 



133. Pertusaria velata (TURN.) NYL. 



On trees, infrequent. Portage, between Rose and Rove 

 lakes, June 27, 1897, no. 2ioa. Tofte (Carlton peak), July 

 10, 1897, no. 577. Ely, July 28, 1897, no. 1017. 



134. Pertusaria multipuncta (TURN.) NYL. 



On trees, frequent at second locality. Tofte (Carlton peak), 

 July 10, 1897, no. 611. Snowbank lake area, July 28, 1897, 

 no. 900. 



135. Pertusaria multipunctata (TURN.) NYL. var. laevigata 

 TURN, and BORR. 



On trees, probably frequent. Grand Portage, June 23, 1897, 

 no. 158. Rose lake, June 28, 1897, no. 2i7a. Gunflint, July 

 2, 1897, no. 389a. Misquah hills, July 5, 1897, no. 478. 



Not previously reported from Minnesota and new to North 

 America. 



136. Pertusaria communis DC. 



On trees, nearly always cedars, common or frequent. Port- 

 age, between Rose and Rove lakes, June 27, 1897, no. 210. 

 Rose lake, June 28, 1897, no. 217. Gunflint, July i, 1897, 

 no. 336, Misquah hills, July 7, 1897, nos. 453 and 499. 

 Beaver Bay, July 13, 1897, no. 664, and July 15, 1897, no. 

 782. Snowbank lake area, July 21, 1897, nos. 870 and 888. 



137. Pertusaria sp. 



On trees. Spores nearly like the above in the few apothecia 

 not transformed into soredia. Thallus lighter colored at cir- 

 cumference with frequent two or three dark lines near circum- 

 ference. Misquah hills, July 3, 1897, no. 410. Beaver Bay, 

 July 15, 1897, no. 688. Snowbank lake area, July 19, 1897, 

 no. 826. 



138. Pertusaria leioplaca (Acn.) SCHAER. 



On trees, widely distributed but seldom common in any local- 

 ity. Grand Portage, June 23, 1897, no. 91. Portage between 

 North Fowl lake and Moose lake, June 26, 1897, no. 192. 

 Rose lake, June 28, 1897, no. 218. Gunflint, June 30, 1897, 

 no. 275, and July 2, 1897, no. 399. Misquah hills, July 5, 

 1897, no. 491 a. Beaver Bay, July 15, 1897, no. 784. Ely, 

 July 28, 1897, no. 1010. Varying greatly according to sub- 

 stratum. On young trees with smooth bark the thallus is thin 

 and smooth and the ostioles frequently indistinct. On older 

 trees with rough bark the thallus is thicker and broken, and 



