Umbilicaria americana
# Umbilicaria americana

Umbilicaria americana, commonly known as frosted rock tripe, is a foliose lichen of rock faces.

## Description

Umbilicaria americana has been described as looking like "grayish-white potato chips." The upper surface is gray with the appearance of white dusting. The lower surface is black. The lobes are 2 to 7 cm in diameter.

