47 species
2 subspecies and varieties
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Caloplaca bolacina
Description: Thallus yellow-orange, thick, somewhat waxy; Squamules slightly lobed; Apothecia to 2 mm in diameter, disks orange with paler margins.
Distribution: West of Cascades crest in Washington; Oregon, California.
Habitat: Coastal, to 1600\' elevation where salt spray is present.
Substrate: On rock.
Caloplaca cerina
Description: Thallus blue-grey to whitish, smooth to areolate. Apothecia bright yellow, to 2 mm in diameter, sometimes slightly pruinose, with raised grey margin.
Distribution: Washington; Reported in all continental US states with the exceptions of Nevada, Louisiana and Florida; Canada.
Habitat: In open woodlands.
Substrate: Common on bark, esp. of poplar and elm.
Caloplaca epithallina
Description: Thallus within the host; Apothecia clustered, rusty red-orange, with dark orange to black margins
Distribution: East of Cascades crest in Washington; eastern Oregon, northeastern California, Idaho, Montana, Wyoming, Colorado, Utah, New Mexico; British Columbia.
Habitat: Arctic/alpine.
Substrate: Parasitic on a variety of arctic/alpine lichens growing on siliceous rock.
Caloplaca feracissima
Description: Thallus nearly imperceptible, dark grey to yellowish; Apothecia to 0.5 mm in diameter, crowded, dull orange to orange-brown with egg-yolk yellow margins.
Distribution: West of Cascades crest in Washington; midwest and eastern United States with disjunct across New Mexico-Texas border.
Substrate: Mortar, cement, concrete and natural limestone.
Caloplaca flavogranulosa
Description: Thallus yellow-orange, squamulose to areolate, areoles discrete to 0.4 mm in diameter, commonly constricted at the base, with conspicuous yellow-orange prothallus; Apothecia common, to 1.1 mm in diameter.
Distribution: West of Cascades crest in Washington; coastal Oregon and northern California; coastal British Columbia.
Habitat: Lower salt-spray zone.
Substrate: Maritime rock.
Caloplaca flavorubescens
Description: Thallus pale sulphur-yellow, grey when in shade, continuous and smooth; Apothecia orange, occasionally with pale yellow to white pruina, to 1.5 mm in diameter.
Distribution: West of Cascades crest in Washington; Montana, Wyoming, Utah, Colorado, Arizona, New Mexico, midwestern states, Arkansas, Louisiana, Mississippi, Alabama, Georgia, New York to Maine; southern Canada from Alberta to Nova Scotia.
Substrate: On bark of deciduous trees and conifers, and on wood.
Caloplaca holocarpa
Description: Apothecia abundant, 0.3-0.5 mm, orange to orangish-yellow, margins of same color or slightly lighter.
Distribution: Washington; Uncertain, but widespread in US boreal and temperate zones.
Substrate: Abundant on bark and wood of many tree species. May also occur on rock.
Caloplaca inconspecta
Description: Thallus highly variable, from inconspicuous to yellow-orange and areolate; Areoles scattered and convex, less than 0.2 mm; Apothecia generally abundant, scattered to crowded, yellow to yellow orange, 0.3-1.1 mm.
Distribution: Washington;
Habitat: Upper intertidal zone to beach edge.
Substrate: Rock and driftwood.
Caloplaca luteominia
Description: Thallus areolate, or entirely within rock; Areoles scattered or contiguous, pale brown to pinkish; Apothecia orange or scarlet, 0.6-1.2 mm, margins paler.
Distribution: Washington;
Habitat: From coastal mountains to upper intertidal zone.
Substrate: On rock.
Caloplaca verruculifera
Description: Thallus bright orange to dark yellow, appearing in circular patches with narrow lobes around the periphery; Lobes convex and flattened at tips, 0.3-0.8 mm wide and 1-5 mm in length; granular isidia often present in center of older thallus; Apothecia rare.
Distribution: Washington; Alaska; British Columbia;
Habitat: Coastal, in salt-spray zone.
Substrate: On rock, especially where bird manure is present.