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Rhizocarpon geographicum (L.) DC.
Yellow map lichen, world map lichen
This is one of several “map lichens,” so-called because at close range, each tiny lichen is bordered by black spores that resemble borders on a map. Yellow map lichen is common in cool forests, such as the Sierra Nevada mountains, northern Maine, Canada, Greenland, Iceland, and Siberia. Closer to the equator, it is found at progressively higher elevations. Although it can withstand two weeks of exposure to space, it is sensitive to pollution, and fares best in low pollution environments. Identification: The pale yellow patches with black spore-lined edges do not closely resemble other lichens. Yellow map lichen is crustose, forming a thin, tightly attached surface on rocks. Online References:
Rhizocarpon geographicum on Wikipedia Rhizocarpon geographicum at Stephen and Sylvia Sharnoff's lichen.com site Rhizocarpon geographicum on botanyphoto.botanicalgarden.ubc.ca Rhizocarpon geographicum at Alan Silverside's Lichen Pages on LastDragon.org Rhizocarpon geographicum on the Toolik↔Arctic Geobotanical Atlas References:
Walewski, Joe, Lichens of the North Woods, Kollath+Stensaas Publishing, 2007, p. 66
9/19/2009 · Acadia National Park, Bar Harbor, Maine
9/28/2013 · Cadillac Mountain, Acadia Naitonal Park, Bar Harbor, Maine
9/19/2009 · Acadia National Park, Bar Harbor, Maine Rhizocarpon geographicum description by Thomas H. Kent, last updated 25 May 2020.
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9/15/2016 · Cadillac Mountain Summit, Acadia National Park, Bar Harbor, Maine
9/19/2009 · Acadia National Park, Bar Harbor, Maine
The gray patches are single-spored map lichen (Rhizocarpon disporum) · 9/19/2009 · Acadia National Park, Bar Harbor, Maine
9/19/2009 · Acadia National Park, Bar Harbor, Maine
9/19/2009 · Acadia National Park, Bar Harbor, Maine
9/28/2013 · Cadillac Mountain, Acadia Naitonal Park, Bar Harbor, Maine
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ID is uncertain 
