Fink: LICHENS OF NORTHWESTERN MINNESOTA. 689 



48. Peltigera canina (L.) HOFFM. var. sorediata SCHAER. 



On earth, frequent. Battle lake, June 23, 1900, no. 152. 

 Leaf hills, June 26, 1900, no. 216. Bemidji, July 4, 1900, 

 no. 439. Thief River Falls, July 17, 1900, no. 765. Red 

 lake, July 27, 1900, nos. 921 and 931. 



49. Peltigera canina (L.) HOFFM. var. leucorrhiza FLK. 



On earth in tamarack swamps, infrequent. Henning, June 

 25, 1900, no. 194 and June 29, 1900, no. 342. Bemidji, July 

 9, 1900, nos. 534 and 546. Red lake, July 28, 1900, no. 941. 



Not previously reported from Minnesota. 



50. Heppia despreauxii (MONT.) TUCK. 



On calcareous earth, infrequent. Battle lake, June 20, 

 1900, no. 57. Leaf hills, June 26, 1900, no. 232, June 27, 

 1900, no. 264 and July 2, 1900, no. 394. Thief River Falls, 

 July 17, 1900, no. 773. 



51. Pannaria languinosa (AcH.) KBR. 



On mossy tree bases, rare. Henning, June 28, 1900, no. 

 300. Bemidji, July 5, 1900, no. 458, July 9, 1900, no. 549 

 and July n, 1900, no. 625. Thief River Falls, July 17, 1900, 

 no. 763. Red lake, July 28, 1900, no. 946. 



52. Pannaria petersii TUCK. 



On calcareous pebbles, rare. Leaf hills, July 2, 1900, no. 

 399. With thallus nearly obsolete, the same condition occur- 

 ring occasionally in northern Iowa. 



Not previously reported from Minnesota. 



53. Collema pycnocarpum NYL. 



On trees, rare. Battle lake, June 19, 1900, no. 33 and June 

 21, 1900, no. no. Bemidji, July 5, 1900, no. 467, July n, 

 1900, no. 607, July 12, 1900, no. 686 and July 14, 1900, no. 

 724. Red lake, August 3, 1900, no. 1069. 



54. Collema flaccidum ACH. 



On trees, infrequent. Battle lake, June 23, 1900, no. 155. 

 Henning, June 29, 1900, no. 351. Bemidji, July 12, 1900, no. 

 668. 



55. Collema nigrescens (Huos.) ACH. 



On trees, frequent. Henning, June 29, 1900, nos. 349 and 

 359. Bemidji, July 12, 1900, no. 693. Red lake, August 3, 

 1900, no. 1074. 



