. . . . . . . . . "Physcia adscendens" . . "Populus fremontii" . . "Justin. 2014. Physcia adscendens host Populus fremontii. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/910066> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .