Watts, J.L., Raynor, S.J. & Manzitto-Tripp, E.A. (2025) Character evolution in Heterodermia s.l. (Physciaceae; Caliciales) and two new species from the southern Rocky Mountains, USA. Phytotaxa 698 (2): 61–81. https://doi.org/10.11646/phytotaxa.698.2.1