| Umbilicaria americana | |
|---|---|
| U. americana growing on rock faces | |
| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Family: | Umbilicariaceae |
| Genus: | Umbilicaria |
| Species: | U. americana |
| Binomial name | |
| Umbilicaria americana |
|
Umbilicaria americana, commonly known as Frosted Rock Tripe, is a foliose lichen of rock faces.
U. americana has been described as looking like "grayish-white potato chips."[1] 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.[2]