Acarospora socialis (bright cobblestone lichen) is a usually bright yellow areolate to squamulose crustose lichen in the family Acarosporaceae that grows up to 10 cm wide, mostly on rock in western North America.

[1] Two apothecia may merged leaving a peninsula (umbo) of thalline tissue through the disc.

[1] Secondary metabolites include rhizocarpic acid, and sometimes trace amounts of epanorin.

[1] It is also similar to Acarospora chrysops, which grows from South America to central Mexico, through Texas and into the Rocky Mountains.

[1] It is very similar to Pleopsidium flavum at mid-level mountains, with the latter favoring higher elevations, above 900 metres (3,000 ft), and being somewhat effigurate with smaller (less than 1 mm) yellow apothecia.