. . . . . . . . . "Tsuga heterophylla" . . "Picea sitchensis" . . "Nature Ali. 2012. Tsuga heterophylla associated species with names lookup Picea sitchensis. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/7667716> 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." .