Giralt, M., Boom, P.P.G.V.D., Mayrhofer, H. & Elix, J.A. (2014)

Three new species of crustose Physciaceae from Guatemala, with notes on some additional species

. Phytotaxa 164 (2): 79–90. https://doi.org/10.11646/phytotaxa.164.2.2