Another dark taxon comes to light: Semicentenialomycetes, a new class within the Pucciniomycotina (Basidiomycota), and its described living representative, Semicentenialea rex

Partially because there are several deeply divergent fungal lineages, including hypothesized class- and order-level lineages, currently known only by eDNA sequences. Here, we describe the first living representative of one such lineage (previously referred to as Clade GS25).

We use a phylogenomic approach to test the placement and taxonomic rank hypothesized for this lineage, and present the formally described Semicentenialea rex, as the first known species in the novel class Semicentenialomycetes (Pucciniomycotina, Basidiomycota). Additionally, we provide the first phylogenomic resolution of Pucciniomycotina, using reference genomes from all described classes with the exception of Cryptomycocolacomycetes.