Davydov, E.A. 2022.

On the status of Umbilicaria aprina var. halei and U. canescens (Umbilicariaceae, lichenized Ascomycota)

. Phytotaxa. 533, 1 (Feb. 2022), 91–97. DOI:https://doi.org/10.11646/phytotaxa.533.1.6.