Gyrophora muhlenbergii Ach. Lichenes. Rock Tripe.

Arctic climates. Franklin says, when boiled with fish-roe or other animal matter, this lichen is agreeable and nutritious and is eaten by the natives.

Gyrophora vellea Linn. Ach. Rock Tripe.

Cold regions. This lichen forms a pleasanter food than the other species of this genus.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.