Description: Scientific Name: Lecanora thysanophora R. C. Harris Common Name: Mapledust Lichen Certainty: positive (notes) Location: Southern Appalachians; Smokies; CabinCove Date: 20060627 Close-up of fibrous hypothallus, at 30x. What are those concentric black lines?. Date: 7 August 2007, 23:37. Source: Mapledust Lichen Uploaded by Amada44. Author: Jason Hollinger.