Alyxoria sierramadrensis

Alyxoria sierramadrensis is a species of saxicolous (rock-dwelling) crustose lichen in the family Lecanographaceae. The species is known from six localities in the Mexican states of Coahuila and Nuevo León, where it grows on exposed limestone outcrops at elevations between roughly 800 and 1,500 m (2,600 and 4,900 ft). It occurs in semi-arid scrubland communities with scattered oaks, often alongside other lime-loving lichens. Many populations fall within the expanding Monterrey metropolitan area, where limestone quarrying and air pollution pose potential threats. ...read more on Wikipedia.