The genus has undergone many updates since it was first described; however, there are some missing pieces in the phylogenetic relationships among species. The present review aimed to: (i) understand the evolutionary meaning of their different spore wall ornamentations; (ii) define the best molecular marker for phylogenetic inferences, (iii) address some specific issues concerning the polyphyletic nature of and , and the inclusion of species; and (iv) update the global geographical distribution of species. As such, the wall ornamentation of previously described species was reviewed and phylogenetic analyses were carried out based on ITS and SSU-ITS-LSU (nrDNA). Moreover, the already available type material of was inspected. According to the data obtained, temperate and tropical zones are the richest in species. We also confirmed that does not belong to . Furthermore, our phylogeny supported the monophyly of genus, including the species, and . The nrDNA phylogeny presented the best resolution and revealed the homoplasic nature of many ornamentations in species, pointing out their unfeasible phylogenetic signal. This review reinforces the urgency of more molecular markers, in addition to the nrDNA sequences, for the definition of a multi-locus phylogeny.
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