Photo 2252704, (c) Joe Walewski, some rights reserved (CC BY-NC), uploaded by Joe Walewski

Attribution © Joe Walewski some rights reserved Uploaded by jwalewski Source iNaturalist Associated observations Photos / Sounds What Concentric Boulder Lichen (Porpidia crustulata) Observer jwalewski Date August 9, 2015 04:51 PM CDT Place Tettegouche, Lake, Minnesota, United States (Google, OSM) Date Added August 11, 2015 07:59 AM CDT 2 IDs Research Grade View Sizes small medium large original