DCHP-1 Online
caribou moss 
a whitish-gray lichen, Cladonia rangiferina, a staple food of the caribou.
See also: reindeer lichen reindeer moss snow moss
- 1744 [Near the Rivers and Sea-coast, there was small shrubby Woods, but for many Miles, at least 60 farther into the Country, they had nothing but a barren white Moss upon which the Rain-Deer feed. . . .]
- 1857 (1860) Moving on to a spot more favourable, perhaps because it is level, small batches of caribou moss began to show themselves.
- 1963 They didn't know . . . how to brew a stew of wild roots to make a meal of caribou moss.
- 1744 [Near the Rivers and Sea-coast, there was small shrubby Woods, but for many Miles, at least 60 farther into the Country, they had nothing but a barren white Moss upon which the Rain-Deer feed. . . .]