Macalpinomyces was established in 1977, with the type species M. eriachnes described from a specimen
collected in northern Australia on the grass Eriachne sp. in 1855. Subsequently, M. eriachnes has been
reported on more than 21 species of Eriachne in northern Australia. In this study, a polyphasic approach
was employed to determine whether M. eriachnes masked cryptic diversity. On the basis ofmorphology,
multilocus phylogeny, and coalescent methods of generalized mixed Yule-coalescent (GMYC) and
Poisson tree processes (PTP) models, 26 specimens of Macalpinomyces on 13 species of Eriachne held
in Australian herbaria were studied. Consequently, 10 new species of Macalpinomyces that satisfied the
phylogenetic species recognition criteria are described.