Fink: LICHENS OF NORTHWESTERN MINNESOTA. 709 
209. Pyrenula punctiformis (Acu.) Nac. var. fallax Nyv. 
On birch trees, common. Henning, June 25, 1900, no. 170 
and June 29, 1900, no. 353. Bemidji, July 11, 1900, nos. 601 
and 624 and July 12, 1900, no. 670. Red lake, August 1, 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 (Acu.) Nake. 
On trees, rare. Thief River Falls, July 18, 1900, no. 798. 
211. Pyrenula hyalospora (Nyu.) Tuck. 
On trees, locally frequent. Red lake, July 26, 1900, no. 
887. 
212. Pyrenula cinerella (FLor.) Tuck. 
On birch, locally common. Henning, June 29, I900, no. 
348. 
213. Pyrenula cinerella (FLor.) Tuck. var. quadriloculata 
FINK. 
On birch, common. Bemidji, July 11, 1900, nos. 600 and 
632. Red lake, July 26, 1900, no. 897. 
214. Pyrenula leucoplaca (WAHL.) Kpr. 
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 11, 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 (WaAHL.) Kpr. var. pluriloculata var. 
nov. 
On trees, infrequent. Battle lake, June 18, 1900, no. Io 
and June 21, 1900, no. 111. Henning, June 29, 1900, no. 
Bor eemidyi, July 11, 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. 
