276 MINNESOTA BOTANICAL STUDIES. 



258. Pyrenula cinerella (PLOT.) TUCK. var. quadriloculata, var. 



nov. 



Spores 12-15 by 5-6^ mic., passing from 2 and occasion- 

 ally 3-celled to a much more common 4-celled condition. The 

 apothecia somewhat below normal size for the species. Pyren- 

 ula punctiformis Ach., Naeg. vw.fallax Nyl., quite commonly 

 occurs with the species and variety, as it does with the latter in 

 the present instance and with the former both in Minnesota and 

 Iowa. 



On birch, probably common locally. Grand Portage island, 

 June 24, 1897, no. 85. 



