Aspicilia cuprea, the copper sunken disk lichen, is a large 1–20-centimeter (0.4–7.9 in) diameter copperish-tan to brown crustose areolate lichen that forms large patches of adjacent lichens on rock (saxicolous).

[2][1] It is common and characteristic of siliceous rock in interior valley and western mountains of California.

[1] One to many irregularly shaped black apothecia are sunken into the thallus.

[1] Lichen spot tests are K+ red, C−, P+ orange, and I−.

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