Clemensia albata (Little White Lichen Moth). The larvae feed on the alga Protococcus viridis. This alga grows on the smooth tree bark such as birch (Betula) and maple (Acer). The larvae are also reported to feed on the lichens Parmelia and Lobaria pulmonaria.
Clemensia albata, An Algal Feeding Arctiid. http://images.peabody.yale.edu/lepsoc/jls/1980s/1981/1981-35(1)34-McCabe.pdf
Noel McFarland (). Larval Foodplant Records for 106 Species of North American Moths. Journal of the Le[pidopterist's Society. Vol. 29, No. 2:112-125.
"Clemensia alhata Pack. (det. BB )-Ar.33. *W. OREGON: Captive larvae (autumn-spring) readily accepted the locally-common foliose lichen, Loharia pulmonaria (L.) Hoffm.-STICTACEAE (1962)."
''Clemensia albata'', the little white lichen moth, is a moth of the family Erebidae. It was described by Packard in 1864. It is found in eastern North America, west across boreal Canada to south-eastern British Columbia. The range extends along the Pacific Coast south to Monterey Bay in west-central California. The habitat consists of moist forests, including coastal rainforests, oak woodlands and mixed hardwood forests.
The length of the forewings is 10–11 mm. The forewings are pale.. more