Caloplaca saxicola is a small bright orange crustose lichen that grows on rock all over the world.

[3] Apothecia may be immersed in the thallus or adnate to it, with rims of thallus-like tissue (lecanorine) with orange, flat, .4–1 mm wide epruinose discs.

C. ignea and C. impolita are similar but bigger, and have apothecia that form near the thallus center.

[2]: 245–6  This lichen occurs over a portion of northern North America.

[4] A specific example occurrence is within the northern reaches of the Canadian Boreal forests, where Black Spruce is a dominant tree.