Photo 76562373, (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 2 photos What Concentric Boulder Lichen (Porpidia crustulata) Observer jwalewski Date June 2, 2020 06:11 AM CDT Place Lake County, MN, USA (Google, OSM) Date Added June 2, 2020 01:34 PM CDT 2 IDs Research Grade View Sizes small medium large original