4 
20. 
* Combeoicles Nyl. 
Calif. 
21. 
testudinaria Nyl. 
Calif. 
22. 
bistorta Nyl. 
Mexico. 
23. 
cuspidata Ach. 
“Am. bor.” 
24. 
Montagnei DN. 
“ New Orleans.” 
25. 
denticulata Eschw. 
Mexico. 
var. canalicularis Nyl. 
Mexico. 
26. 
usneoides (Ach.) Fr., var. 
usneoidella Nyl. Mexico. 
3. Dactylina (Nyl.) Tuck. 
27. 
ramulosa Hook. 
Arctic. 
28. 
arctica (Hook.) Nyl. 
Arctic. 
20. 
* madrepiformis Wulf. 
Rocky Mts. 
4. Cetraria Ach., Fr. 
30. 
* tristis Fr. 
Arctic. 
31. 
* Fahlunensis (L.) Schser. 
Alpine. 
var. sciastra Fr. 
Alpine. 
32. 
sepincola Ach. 
Alpine. 
33. 
* Californica Tuck. 
Calif. 
34. 
** Fendleri Tuck. 
U. S. 
35. 
aculeata Fr. 
Northern and Arctic. 
36. 
Richardsonii Hook. 
Arctic. 
37. 
** Islandica Ach. 
Northern and Alpine. 
varr. platyna Fr.: crispa Ach. 
38. 
nigricans Nyl. 
Greenland. 
39. 
* cucullata Ach. 
Alpine. 
40. 
* nivalis Ach. 
Alpine. 
41. 
** ciliaris Ach. 
N. Am. 
42. 
orbatum Nyl. 
Calif. 
43. 
chrysantha Tuck. 
North West. 
44. 
**lacunosa Ach. 
N. Am. 
var. ** Atlantica Tuck. 
Northern 
45. 
**glauca Ach. 
N. Am. 
46. 
** aleurites Ach. 
Northern. 
47. 
** aurescens Tuck. 
Northern. 
48. 
** Oakesiana Tuck. 
Northern. 
49. 
**juniperina Ach. 
N. Am. 
varr. virescens Tuck.: terrestris Schaer.: pinastri Ach.] 
5. Evernia Acli., Maim. 
50. ** furfuracea Mann, 
var. ** cladonia Tuck. 
51. ** prunastri Ach. 
52. divaricata Ach. 
53. * vulpina Wulf. 
N. Am. 
Northern. 
Northern. 
Rocky Mts. 
Rocky Mts. 
