Rhizocarpon petraeum is a species of lichen in the family Rhizocarpaceae.

[1] It contains stictic acid.

[2] It was first described as Lichen petraeus in 1787 by Franz Xaver von Wulfen,[3][4] but was transferred to the genus Rhizocarpon in 1852 by Abramo Bartolommeo Massalongo.

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