Recently, an alarming high number of imprecise species descriptions based on mixed phenotypic and molecular data together with insufficient understanding of previous species delimitations was revealed (Koukol et al. 2018; Koukol and Delgado 2019; Delgado et al. 2020). Six out of the 28 binomial names introduced in Hermatomyces (Index Fungorum http://www.indexfungorum.org/) were found to be later synonyms and other three are considered doubtful or described based on insufficient evidence, which gives an error rate of 32% of erroneously described species in a single genus. One of the reasons of this high rate is that many recently described species such as H. clematidis, H. bauhiniae, and H. trangensis amongst others, were introduced based on a single or at most two collections from the same site and host.