Chrysothrix xanthina (Vain.) Kalb
Colombia, Boyaca, Arcabuco, 2600 m, leg. H. Sipman & O. Reyes 34421 [B]
growing on tree trunks and siliceous rock in a wide range of habitats and elevations. The thallus consist completely of fine, yellow soredia.
[picture height = 3.5 mm]