Umbilicaria americana explained

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."[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]

Notes and 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. Book: Walewski, Joe . Lichens of the North Woods . Kollath-Stensaas . City . 2007 . 0-9792006-0-1 .

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