Two new species in the Umbilicaria torrefacta group from Alaska and the Pacific Northwest of North America
McCune B. 2018. Two new species in the Umbilicaria torrefacta group from Alaska and the Pacific Northwest of North America. Graphis Scripta. 30(6):65-77
Field studies in Alaska, Oregon, and Washington revealed unusual morphotypes that appeared similar to U. torrefacta in many ways, but differed in their tough, multilayered growth form. DNA sequencing and thin-layer chromatography confirmed our suspicion that these do not belong with U. torrefacta. Two new species are described, Umbilicaria dura and U. multistrata.