Detailed laconic description of lichens ranges is represented as a formula. The formula is based on the biogeographical subdivision of the world. The formula includes symbols of the biogeographical realms and biomes on the map of the terrestrial ecoregions of the world, where the presence of a species was recorded. The formulas of ranges are given for 34 Umbilicariaceae species recorded in Mongolia. Keywords: lichens, Lasallia, Umbilicaria, ecoregions map, range formula, biogeography, Mongolia.