328 Fink : lichens of the Minnesota valley. 



187. Staurotliele drummondii Tuck. 



On granite, quartzite and pipestone, common in damp places 

 at Granite Falls and Pipestone. Redwood Falls, July 8, 1899, 

 no. 327. Granite Falls, Jul}^ 12, 1899, no. 457, July, 13, 1899, 

 no. 494, and July 17, 1899, no. 554. Pipestone, July 18, 1899, 

 nos. 595, 619, 622 and 628. 



188. Verrucaria fuscella Fr. 



On limestone, infrequent. Mankato, June 23, 1899, no. 42. 



iS8a. Verrucaria nigrescens Pers. 



On limestone common and once seen on a granite bowlder. 

 Mankato, June 23, 1899, no. 65, June 24, 1899, no. 96, and 

 June 26, 1899, no. 116. 



189. Verrucaria muralis Ach. 



On limestone in bluffs and drift pebbles, abundant at Man- 

 kato. Mankato, June 22, 1899, no. 26. Granite Falls, July 

 13, 1899, no. 511, and July 14, 1899, no. 525. 



190. Pyrenula punctiformis (Ach.) Naeg. 



On trees, infrequent. Mankato, June 24, 1899, ^^^' 9° ^"^ 94" 



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

 On birch, infrequent. Mankato, June 24, 1889, no. 66, and 



June 26, 1899, no. 109. 



192. Pyrenula gemmata (Ach.) Naeg. 



On trees frequent. Granite Falls, July 14, 1899, no. 513. 

 Not previously reported from Minnesota. 



193. Pyrenula hyalospora Nyl. 



On trees, probably rare. Mankato, June 23, 1899, no. 32, 

 and June 25, 1899. Granite Falls, July 13, 1899, no. 470. 

 Not previously reported from Minnesota. 



194. Pyrenula nitida Ach. 



On trees, rare. Mankato, July i, 1899, no. 211. New Ulm, 

 July 3, 1899, no. 222. 



195. Pyrenula thelena (Ach.) Tuck. 



On birch, common. Mankato (Minneopa Falls), June 27, 

 1899, no. 140. 



196. Pyrenula cinerella (Flot.) Tuck. 



On trees, infrequent. Mankato (Minneopa Falls), June 27, 

 1899, no. 143. 



Spores reaching 12-16 by 6-8 mic. in one collection. Thus 

 larger than usual American forms. 



