192 MINNESOTA BOTANICAL STUDIES. 



in the area covered herein, but also to supplement as far as 

 possible the work previously done. That a considerable amount 

 of preliminary work could yet be profitably done both on the 

 distribution and taxonomy of Minnesota lichens is apparent 

 enough, and indeed the subject could hardly be completely ex- 

 hausted. Yet, if nothing more is accomplished in a preliminary 

 way, it is at least to be hoped that the results now scattered 

 throughout several papers may be further correlated, somewhat 

 amplified and brought together into more accessible form in a 

 final report. 



LIST OF SPECIES AND VARIETIES. 



i. Ramalina calicaris (L.) Fr. var. fraxinea Fr. 



On trees, rare. Warroad, July i, 1901, no. 292. Oak 

 island, July 10, 1901, no. 484. Emo, July 17, 1901, no. 644. 

 Koochiching, July 27, 1901, no. 942 and July 26, 1901, no. 

 895. Kettle falls, August 13, 1901, no. 1426. 



2. Ramalina calicaris (L.) Fr. var. fastigiata Fr. 



On trees, common. Beaudette, June 18, 1901, no. 22 and 

 June 22, 1901, no. 98. Warroad, June 25, 1901, nos. 165 

 and 169. Oak island, July 9, 1901, no. 438. Emo, July, 

 no. 671 and July 18, 1901, no. 718. Koochiching, July 2, 

 1901, nos. 876 and 879. Rainy Lake City, August 3, 1901, 

 nos. 1159 and 1172 and August 6, 1901, no. 1240. Kettle 

 falls, August 13, 1901, no. 1415 and August 15, 1901, no. 

 1487. Harding, August 16, 1901, no. 1514. Tower, August 

 29, 1901, no. 1875. 



Some specimens varying toward var. canaliculata Fr. 



3. Ramalina calicaris (L.) var. farinacea Schaer. 

 Frequent on rocks and more rarely on trees. Beaudette, 



June 19, 1901, no. 47. Blueberry island, July 13, 1901, no. 

 508. Mainland, July 16, 1901, no. 635. Emo, July 19, 1901, 

 no. 735 and July 22, 1901, no. 820. Koochiching, July 30, 

 1901, no. 1018. Rainy Lake City, August 1, 1901, no. 1100 

 and August 5, 1901, no. 1179. Kettle falls, August 10, 1901, 

 no. 1375 and August 13, 1901, no. 1448. Harding, August 

 16, 1901, no. 1524, August 19, 1901, no. 1586 and August 21, 

 1901, no. 1666. 



4. Ramalina pusilla (Prev.) Tuck. 



On trees, rare except on balsams. Beaudette, June 24, 1901, 

 no. 139. Oak island, July 8, 1901, no. 385. Emo, July, 1901, 

 no. 657. Koochiching, July 29, 1901, no. 988. 



