Lichens collected by the United States expedition under 
Dr. F. V. Hayden to the Yellowstone region in 1872, by Dr. 
J. M. Coulter, Botanist, and determined by H. Willey. 
Reprinted with corrections from the 6th annual report of 
the U. S. Geological Survey of the Territories, Washing¬ 
ton, 1873, pp. 790-792. 
[The order is that of Tuckerman’s Genera Lichenum .] 
1. Evernia vulpina , Wulf.—On trees at the Grand Falls 
of the Yellowstone. Fertile. 
2. Usnea trichodea, Ach.—In some of the specimens the 
fibrils are tipped with minute black points resembling sper- 
mogones, but no spermatia could be detected. 
3. Alectoria jubcita, Fr.—Shoshone Lake. Infertile. 
3 a. Alectoria Fremontii , Tuck.—On branches of Conif- 
ene. Infertile. 
4. Theloschistesparietinus, (L.,Duf.) Nyl.,var. lyckneus , 
Schrer.—On dead wood, Jackson’s Lake. 
5. Parmelia saxatilis, Ach.—Infertile fragments. 
6. Parmelia conspersa , Ach.—Infertile fragments. 
7. Parmelia physodes, Ach.—On branches.* 
8. Parmelia olivacea , Ach., var. exaspercita , (DN.)—Very 
small and scanty specimens on dead wood. 
9. Umbilicaria polyphylla, Hoffm.—Shoshone Lake. In¬ 
fertile. 
10. Umbilicaria cylindriea, Ach. (?)—Infertile. 
11. Umbilicaria hirsuta , Ach.—Infertile. 
12. Umbilicaria ruejifera , Nyl.—Teton mountains, eleva¬ 
tion 12,000 feet. 
13. Peltiyera aphthosa , Hoffm.—Mystic Lake, near Fort 
Ellis, Montana. 
14. Peltiyera canina, Hoffm.— Teton Canon ; hot springs, 
and elsewhere. 
14 a . Peltiyera canina , Hoffm., var. spuria, Ach.—Teton 
Canon. . 
