Melanelixia subaurifera

Melanelixia subaurifera is a lichen in the Parmeliaceae. Thallus olive-brown color, dull, non-reflective, often rosette-forming, thin, closely appressed centrally but often free at margin, black below, fragile cortex, no pseudocyphellae, isidia tiny, simple, globose to cylindrical, often clustered, white medulla C+ red. The soralia and isidia show pale yellowish marks when rubbed. Apothecia rare.