Trapeliopsis percrenata
Trapeliopsis percrenata was distinguished from Trapeliopsis glaucolepidea by smaller squamules and soralia that may be ± capitate, but Palice & Printzen (2004) and Resl et al. (2015) found that the two taxa are conspecific.

Palice, Z. & Printzen, C. (2004) Genetic variability in tropical and temperate populations of Trapeliopsis glaucolepidea: evidence against long-range dispersal in a lichen with disjunct distribution. Mycotaxon 90: 43–54.
Resl, P., Schneider, K., Westberg, M., Printzen, C., Palice, Z., Thor, G., Fryday, A., Mayrhofer, H. & Spribille, T. (2015). Diagnostics for a troubled backbone: testing topological hypotheses of trapelioid lichenized fungi in a large-scale phylogeny of Ostropomycetidae (Lecanoromycetes). Fungal Diversity 73: 239–258.