Aspicilia pacifica (pacific sunken disk lichen) is a white to grayish, brownish, or ocher crustose areolate lichen that commonly grows on siliceous rock or basalt along the seashore and in higher coastal mountains of California and Baja California.

[1]: 2** [2] It has numerous small (0.1–.8 mm), round to angular apothecia toward the middle of the thallus, with concave to flat black discs that are sometimes lightened with white pruina.

[2] Lichen spot test on the cortex and medulla are I−, K+ yellow to red, P+ orange, and C−.

[2] Secondary metabolites include much stictic acid, and some norstictic acid.

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