Myeloconis sp.
Colombia, Nariño, 35 m, leg. H. Sipman, R. Velosa et al. 33039 [B].
On tree trunk in primary lowland forest. This genus is mostly found without ascomata, and then easily recognizable by its yellow-orange medulla, which is exposed in irregular, abraded, soralia-like spots.
[picture height = 3.5 mm]