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).
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