232 MINNESOTA BOTANICAL STUDIES. 



272. Arthonia dispersa (Schrad.) Nyl. 



On trees, common especially on Acer spicatum Lam. Beau- 

 dette, June 24, 1901, no. 137. Warroad, June 26, 1901, no. 

 194. Koochiching, July 25, 1901, no. 872. Rainy Lake City, 

 August 3, 1901, no. 1142 and August 5, 1901, no. 1181. Hard- 

 ing, August 17, 1901, no. 1554. Tower, August 26, 1901, no. 

 1782. 



273. Arthonia convexella Nyl. 



On balsams, rare. Beaudette, June 21, 1901, no. 97. 

 Not previously reported from Minnesota and new to North 

 America. 



274. Arthonia punctiformis Ach. 



On trees, locally frequent. Emo, July 19, 1901, no. 758. 



275. Arthonia radiata (Pers.) Th. Fr. 



On trees, rare. Beaudette, June 20, 1901, no. 85 and June 

 24, 1901, no. 137a. Warroad, June 26, 1901, no. 242. Oak 

 island, July 10, 1901, no. 496. Emo, July 17, 1901, nos. 663 

 and 668 and July 18, 1901, no. 708. Koochiching, July 30, 

 1901, no. 1016. 



276. Arthonia radiata (Pers.) Th. Fr. var. swartziana (Ach.) 



WlLLEY. 



On balsams in swamps, frequent. Rainy Lake City, August 

 3, 1901, no. 1173. Tower, August 28, 1901, no. 1864. 

 Not previously reported from Minnesota. 



277. Acolium tigillare (Ach.) De Not. 



On old wood, rare. Oak island, July 8, 1901, nos. 389 and 



394- 



278. Calicium trichiale Ach. 



On cedars in swamps, rare. Oak island, July 9, 1901, no. 

 453. Rainy Lake City, August 7, 1901, no. 1266. 



279. Calicium trichiale Ach. var. cinereum Nyl. 



On trees, frequent on pines. Beaudette, June 19, 1901, no. 

 55. Mainland, July 16, 1901, no. 626. Emo, July 19, 1901, 

 no. 725. Koochiching, July 30, 1901, no. 1004. Kettle falls, 

 August 13, 1901, no. 1436. 



280. Calicium phasocephalum (Turn.) Turn, and Borr. 



On cedars in swamps, frequent. Beaudette, June 20, 1901, 

 no. 83. Emo, July 19, 1901, no. 745. 



Not previously reported from Minnesota and new to the Mis- 

 sissippi valley. 



