Fink: LICHENS OF NORTHWESTERN MINNESOTA. 709 



209. Pyrenula punctiformis (Acn.) NAEG. var. fallax NYL. 



On birch trees, common. Henning, June 25, 1900, no. 170 

 and June 29, 1900, no. 353. Bemidji, July n, 1900, nos. 601 

 and 624 and July 12, 1900, no. 670. Red lake, August i, 1900, 

 no. 1036. 



The more I see of this plant, the more likely it seems that it 

 will finally have to be separated entirely from this species. 



210. Pyrenula gemmata (AcH.) NAEG. 



On trees, rare. Thief River Falls, July 18, 1900, no. 798. 



211. Pyrenula hyalospora (NYL.) TUCK. 



On trees, locally frequent. Red lake, July 26, 1900, no. 

 887. 



212. Pyrenula cinerella (FLOT.) TUCK. 



On birch, locally common. Henning, June 29, 1900, no. 



348. 



213. Pyrenula cinerella (FLOT.) TUCK. var. quadriloculata 

 FINK. 



On birch, common. Bemidji, July n, 1900, nos. 600 and 

 632. Red lake, July 26, 1900, no. 897. 



214. Pyrenula leucoplaca (WAHL.) KBR. 



On trees, especially poplars, common. Leaf hills, June 27, 

 1900, nos. 268 and 269. Henning, June 29, 1900, no. 344. 

 Bemidji, July 9, 1900, no. 555, July u, 1900, no. 611 and July 

 12, 1900, no. 676. Thief River Falls, July 17, 1900, no. 767, 

 July 18, 1900, nos. 789 and 802 and July 19, 1900, no. 821. 

 Red lake, July 28, 1900, no. 961. 



215. Pyrenula leucoplaca (WAHL.) KBR. var. pluriloculata var. 

 nov. 



On trees, infrequent. Battle lake, June 18, 1900, no. 10 

 and June 21, 1900, no. in. Henning, June 29, 1900, no. 

 357. Bemidji, July u, 1900, no. 597. Thief River Falls, 

 July 18, 1900, no. 799 and July 19, 1900, no. 829. Red lake, 

 August 3, 1900, no. 1073. 



Spores 5-8-celled. 



