236 MINNESOTA BOTANICAL STUDIES. 



304. Verrucaria viridula Ach. var. subfuscella (Nyl.) Fink. 

 On perpendicular rocks, rare. Rainy Lake City, August 



7, 1901, no. 1248. 



Not previously reported from Minnesota and new to the Mis- 

 sissippi valley. 



305. Verrucaria fuscella Fr. 



On rocks by water, rare. Koochiching, July 27, 1901, no. 

 960. 



306. Pyrenula punctiformis (Ach.) Naeg. var. fallax Nyl. 

 On birch, common. Beaudette, June 20, 1901, no. 81 and June 



21, 1901, no. 89. Emo, July 18, 1901, no. 690. Koochiching, 

 July 25, 1901, no. 898. Rainy Lake City, August 5, 1901, 

 no. 1178. 



307. Pyrenula thelena (Ach.) Tuck. 



On birch, locally common. Beaudette, June 21, 1901, no. 

 103. 



308. Pyrenula cinerella (Flt.) Tuck. var. quadriloculata Fink. 

 On birch, locally common. Flag island, July 12, 1901, no. 



55o. 



309. Pyrenula leucoplaca (Wallr.) Kbr. 



On trees, abundant on Pofiiihts. Beaudette, June 24, 1901, 

 no. 138 and June 21, 1901, no. 105. Warroad, June 24, 1901, 

 no. 149. Flag island, July 12, 1901, no. 549. Emo, July 18, 

 1901, no. 682. Koochiching, July 21, 1901, no. 877 and July 

 26, 1901, no. 914. Rainy Lake City, August 6, 1901, no. 

 1236. Harding, August 16, 1901, no. 1520 and August 19, 

 1901, nos. 1582 and 1591. Tower, August 26, 1901, nos. 

 1796 and 1813. 



310. Pyrenula leucoplaca (Wallr.) Kbr. var. pluriloculata 

 Fink. 



On trees, common. Beaudette, June 21, 1901, no. no. 

 Warroad, June 27, 1901, nos. 200 and 209 and June 28, 1901, 

 no. 229. Flag island, July 12, 1901, nos. 534 and 537. 

 Koochiching, July 25, 1901, nos. 862 and 980. Rainy Lake 

 City, August 3, 1901, no. 1487. Kettle falls, August 13, 1901, 

 no. 1419 and August 15, 1901, no. 1489. Harding, August 

 17, 1901, no. 1545 and August 19, 1901, no. 1609. 



