. . . . . . . . . "Fomes fomentarius" . . "Betula papyrifera" . . "Leanne Wallis. 2017. Fomes fomentarius host Betula papyrifera. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/5905587> 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." .