Golden Cobblestone Lichen

"Acarospora contigua" is a species of saxicolous, crustose lichen in the family Acarosporaceae. It was formally described as a new species in 1929 by Swedish lichenologist Adolf Hugo Magnusson. The dark yellow thallus has a continuous smooth crust comprising areoles that are 1–2.5 mm in diameter. In North America, it is known as the gold cobblestone lichen.