Buellia badia (parasitic button lichen) is a dark chocolate-brown crustose areolate lichen of Europe, northern Africa, and North America that starts as a parasite growing on other lichens, such as Aspicilia phaea, gradually then becoming independent growing on rock (sometimes also on hardwood. Areoles may be contiguous or dispersed. Lecideine apothecia are .3 -.9 mm in diameter with black discs, that are initially flat, then become strongly convex as they age. Lichen spot tests are all negative. There are no known [secondary metabolites]] (as of 2001). There are no known secondary metabolites as of (2001). It is similar in appearance and other ways to the chocolate brown Dimelaena californica, which also starts of as a parasite on other lichens, and has spores of similar shape, size, and