''Umbilicaria americana'', commonly known as frosted rock tripe, is a

foliose lichen Foliose lichen is one of the morphological classes of lichens, which are complex organisms that arise from the symbiotic relationship between fungi and a photosynthetic partner, typically algae. This partnership allows lichen to live in diverse ...

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.

References

americana Americana may refer to: *Americana (music), a genre or style of American music *Americana (culture), artifacts of the culture of the United States Film, radio and television * ''Americana'' (1992 TV series), a documentary series presented by J ...

Lichen species Lichens described in 1993 Lichens of North America Taxa named by Thomas Hawkes Nash III Taxa named by Josef Poelt {{Lecanoromycetes-stub