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rock tripe

noun
1.
any lichen of the genus Umbilicaria.
Also called tripe-de-roche.
Origin
1850-1855
1850-55; allegedly so called in reference to the appearance of the thallus
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for rock-tripe

rock tripe

noun
1.
(Canadian) any of various edible lichens, esp of the genus Umbilicaria, that grow on rocks and are used in the North as a survival food
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for rock-tripe

rock tripe

lichen of the genus Umbilicaria, sometimes used as emergency food by soldiers or explorers. It contains about one-third more calories than equal amounts of honey, corn flakes, or hominy; however, this lichen cannot seriously be considered as a food crop because of its slow growth rate. Rock tripe was boiled by Washington's troops at Valley Forge. In Japan U. esculenta, called "iwa-take," or "rock mushroom," is sold as a delicacy and eaten in salads or fried in deep fat. Species of rock tripe are also used as dyes.

Learn more about rock tripe with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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