Collector is virtually certain to be Bonser, Thomas Athelstan 1866-1935. He was collecting at Priest Lake in August of 1910. see for example. 2023-04-25 08:43:19 1718805 FH barcode-00471008 1910-08-00 Pertusaria ambigens T. A. Bonser Idaho [data not captured] https://lichenportal.org/portal/collections/individual/index.php?occid=1718805