684 MINNESOTA BOTANICAL STUDIES. 
7, 1900, no. 516, July 9, 1900, no. 543 and July 12, 1900, no. 
665. Red lake, July 27, 1900, no. 925 and August 4, 1900, 
no. 1083. 
6. Evernia prunastri (L.) Acu. 
Common on pines and abundant on tamaracks in swamps. 
Battle lake, June 23, 1900, no. 140. Henning, June 25, 1900, 
no. 187 and June 28, 1900, no. 312. Bemidji, July 4, no. 428, 
July 6, 1900, no. 518 and July 7, 1900, no. 531. Thief River 
Falls, July 19, 1900, no. 827. Red lake, July 28, 1900, no. 
O70: 
7. Usnea barbata (L.) Fr. 
On trees, frequent. Henning, June 28, 1900, no. 513. 
8. Usnea barbata (L.) Fr. var. florida FR. 
On trees, frequent. Battle lake, June 19, 1900, no. 27. 
Henning, June 25, 1900, no. 174. Leaf hills, June 24, 960% 
no. 248. Bemidji, July 4, 1900, no. 425, July 7, 1900, no. 
532 and July 12, 1900, no. 666. Thief River Falls, July 20, 
1900, no. 838. Red lake, July 28, 1900, no. 945 and August 
2, IQ00, no. 1053. 
g. Usnea barbata (L.) Fr. var. ceratina SCHAER. 
On trees, frequent. Henning, June 30, 1900, no. 375. 
10. Usnea barbata (L.) Fr. var. dasypoga Fr. 
On trees, abundant. Henning, June 25, 1900, no. Iog1. 
11. Usnea cavernosa Tuck. 
On trees, frequent. Henning, June 25, 1900, nos. 182, 192 
and 193, June 28, 1900, nos. 298 and 337 and July 2, 1900, no. 
410. Bemidji, July 5, 1900, nos. 469, 470 and 488, July 7, 
1900, nos. 505, 513 and 519, July 8, 1900, nos. 534, 536 and 
544, July 9, 1900, no. 546 and July 13, 1900, no. 715. Red 
lake, July 27, Ig00, nos. g10, g12 and 920, July 28, 1900, no. 
942 and July 30, 1900, nos. 978, 987 and ggo. 
11. Alectoria jubata (L.) Tuck. 
On cedars, frequent. Bemidji, July 6, 1900, nos. 515 and 
520 and July 13, 1900, no. 7oI. 
13. Alectoria jubata (L.) Tuck. var. chalybeiformis Acu. 
On pines and tamaracks, infrequent. Henning, June 28, 
1900, no. 338. Bemidji, July 4, 1900, no. 426, July 5, 1900, 
no. 473, July 7, 1900, no. 512, July 8, 1900, no. 543 and July 
