Phlyctis petraea, the eggshell rock blaze,[1] is a species of saxicolous (rock-dwelling) crustose lichen in the family Phlyctidaceae.

[2] Found in eastern North America, it was formally described as a new species in 2017 by Richard Clinton Harris, Zachary Muscavitch, Douglas Ladd, and James Lendemer.

[3] Because of its widespread occurrence throughout eastern North America and its abundant and stable populations, it is considered a species of least concern by the International Union for Conservation of Nature.

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