Fink : lichens of the Minnesota valley. 329 



197. Pyrenula cinerella (Flot.) Tuck. var. quadriloculata var. 

 nov. 



On birch, probably rare. Mankato, June 26, 1899, no. 129. 

 Mankato (Rapidan), June 28, 1899, no. 163a. 



Second time collected in Minnesota and both times from 

 hosts of same genus. 



198. Pyrenula quinqueseptata (Nyl.) Tuck. 



On trees, rare. Mankato, July i, 1899, no. 208. 

 Spores frequently showing 8 cells, which is not common for 

 the species. 



Not previously reported from Minnesota. 



199. Pyrenula leucoplaca (Wallr.) Kbr. 



On trees, common. Mankato, June 23, 1899, no. 31. Man- 

 kato (Rapidan), June 28, 1899, no. 180. Mankato, July i, 

 1899, no. 207. Granite Falls, July 13, 1899, ^^- 4^4' and July 

 15, 1899, nos. 527, 535 and 543. 



200. Pyrenula glabrata (Ach.) Mass. 



On trees, rare. Mankato, June 24, 1899, no. 88. 

 Not previously reported from Minnesota. 



201. Pyrenula megalospora sp. nov. 



Thallus rather smooth, indeterminate, prominent, gray or 

 grayish white. Apothecia scattered or occasionally aggregated 

 in clusters of two or three, black or brownish black, convex 

 with the ostiole-bearing apex somewhat pointed, semi-immersed 

 or becoming more superficial, .4 to .75 mm. in diameter. Am- 

 phithecium white. Paraphyses capillary and very distinct. 

 Asci cylindrical, .25 to .3 mm. in length. Spores colorless, 2- 

 celled, oblong with ends obtuse or somewhat pointed, somewhat 

 constricted at the septum, large for 2-celled spores of the genus 

 (35-60 by 14-21 mic), 8 in asci, crowded and obliquely uni- 

 seriate. 



On trees, frequent. Mankato, June 26, 1899, no. 112 and 

 July I, 1899, no. 209. Granite Falls, July 11, 1899, "o- 3^^ 

 and July 11, 1899, "^' 57^* 



