* Sato S, Katsuya K, Hiratsuka Y (1993) Morphology, taxonomy and nomenclature of Tsuga-Ericaceae rusts. Transactions of the Mycological Society of Japan 34(1): 47-62.
------- confirmed host
* Pinon J (1986) Situation de Melampsora medusae en Europe. Bulletin OEPP/EPPO Bulletin 16, 547-551.
------- infection reported after following inoculation studies.
* Pinon J (1986) Situation de Melampsora medusae en Europe. Bulletin OEPP/EPPO Bulletin 16, 547-551.
------- infection reported after following inoculation studies.
* Maier CT, Lemmon CR, Fengler JM, Schweitzer DF, Reardon RC, (2004) Caterpillars on the Foliage of Conifers in the Northeastern United States. Morgantown, WV. USDA Forest Service. Forest Health Technology Enterprise Team Connecticut Agricultural Experiment Station. FHTET-2004-01. March 2004. 151 p.