Rock tripe is the common name for various lichens of the genus Umbilicaria that grow on rocks.

Rock tripe (Umbilicaria spp.

Umbilicaria mammulata, or Smooth Rock Tripe, is a foliose lichen found on boulders and rock walls.

Umbilicaria americana, commonly known as Frosted Rock Tripe, is a foliose lichen of rock faces.

It is similar to the species Umbilicaria americana, which has a more southern distribution.

Rock tripe is the common name for various lichens of the genus Umbilicaria that grow on rocks.

The ear may be regarded, fancifully, as a lichen, Umbilicaria, on the side of the head, with its lobe or drop.

Umbilicaria vellea is a species of lichen in the genus Umbilicaria.

Umbilicaria esculenta is a lichen of the genus Umbilicaria that grows on rocks.

One species of Umbilicaria, Iwa-take (U. esculenta), is used in a variety of traditional Korean and Japanese foods.

Lichens are found in rocky areas, including Cetraria, Cladina, Cladonia, Xanthoria and Umbilicaria genera.