Fink: lichens of the northern boundary. 235 



1901,110. 1339 and August 13, 1901, no. 1411. Harding, Au- 

 gust 20, 1901, no. 1625. Tower, August 26, 1901, no. 1780. 



295. Endocarpon fluviatile DC. 



On wet rocks, locally common. Koochiching, July 26, 

 1901, no. 902. Rainy Lake City, August 6, 1901, no. 1237. 

 Harding, August 21, 1901, no. 1663. 



296. Endocarpon arboreum Schwein. 



On trees, rare. Rainy Lake City, Augusts, 1901, no. 1155. 



297. Endocarpon pusillum Hedw. var. garovaglii Kph. 

 On earth, rare. Tower, August 27, 1901, no. 1838. 



298. Thelocarpon prasinellum Nyl. 



On rocks, rare. Kettle falls, August 10, 1901, no. 1355. 



299. Staurothele umbrina (Wahl.) Tuck. var. clopima 

 (Whlnb.) Nyl. 



On rocks by water, common. Koochiching, July 26, 1901, 

 no. 910 and July 30, 1901, no. 1015. Rainy Lake City, 

 August 1, 1 901, no. 1080. Kettle falls, August 15, 1901, no. 

 1491. Harding, August 25, 1901, no. 1646. Tower, August 

 28, 1 90 1, no. 1845. 



300. Sagedia oxyspora (Nyl.) Tuck. 



Common on birch. Warroad, June 25, 1901, no. 193 and 

 June 21, 1901, no. 204. Emo, July 17, 1901, no. 665 and 

 July 19, 1901, no. 724. Rainy Lake City, August 2, 1901, 

 no. 1113. Kettle falls, August 15, 1901, no. 1492. Harding, 

 August 16, 1901, no. 1522. Tower, August 26, 1901, no. 

 1789. 



301. Verrucaria epigaea (Pers.) Ach. 



On earth, rare. Rainy Lake City, August 5, 1901, no. 

 1201. Harding, August 16, 1901, no. 1523. 



302. Verrucaria nigrescens Pers. 



On rocks, frequent. Oak island, July 9, 1901, no. 436. 

 Koochiching, July 27, 1901, no. 953. Harding, Angust 16, 

 1901, no. 1530. 



303. Verrucaria viridula Ach. 



On rocks by water, frequent. Koochiching, July 27, 1901, 

 no. 955. Harding, August 21, 1901, no. 1657. Tower, 

 August 28, 1901, no. 1847. 



