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Umbilicaria americana
Umbilicaria americana growing on rock faces
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Ascomycota
Class:	Lecanoromycetes
Order:	Umbilicariales
Family:	Umbilicariaceae
Genus:	Umbilicaria
Species:	U. americana
Binomial name
Umbilicaria americana Poelt & T.H.Nash (1993)

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.

References

1. "Rocky Mountain National Park- Umbilicaria americana (U.S. National Park Service)." Jul 14, 2007.http://www.nps.gov/romo/umbilicaria_americana.htm (accessed Dec 17, 2008).
2. Walewski, Joe (2007). Lichens of the North Woods. City: Kollath-Stensaas. ISBN 0-9792006-0-1.

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