Photo 6146908, (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 Shield Lichen (Parmelia sulcata) Observer jwalewski Date January 29, 2017 09:43 AM CST Place Lake, Minnesota, United States (Google, OSM) Date Added January 29, 2017 01:01 PM CST Description on Birch 2 IDs Research Grade View Sizes small medium large original