^ abcd"Entoleuca mammata". Systematic Mycology and Microbiology Laboratory Database. U.S. Department of Agriculture, Agricultural Research Service. 19 March 2012. Retrieved 19 March 2012. Entoleuca mammata: Populus tremuloides: Canada, British Columbia – 36774, Salix myrsinifolia: Poland – 44009, Salix sp.: Austria – 33439, Sorbus aucuparia: Austria – 33439[permanent dead link]
^ abcdefg"CTD — Canker Diseases: Hypoxylon Canker". Common Tree Diseases of British Columbia. Natural Resources Canada through the Pacific Forestry Centre. 30 December 2011. Archived from the original on 18 November 2010. Retrieved 19 March 2012. Hypoxylon mammatum is found only on hardwoods, most commonly on poplar and willow. In B.C., it has been reported on aspen, willow, and Sitka alder. Elsewhere in North America it has also been found on other poplar spp., birch, apple, oak, and hop-hornbeam.