Umbilicaria isidiosa (lichenized Ascomycota), a new species from Bolivia

Umbilicaria isidiosa, a new species from Bolivia, is described. It is characterized by the ashy brown to Mouse grey, pruinose, smooth to slightly scabrous upper Surface of its thallus with numerous globular to richly branched isidia Clustered at its margin, and a lower surface that is blackish and smooth to scabrous with sparse, blackish rhizines.